ILLINOIS WATER AND
CLIMATE SUMMARY
OCTOBER 2016 OVERVIEW
October 2016
65+1-4(411(:6
Temperatures were above and precipitation was below the long-term
average in Illinois in October. Mean streamflow statewide was above the
median for the month. Shallow groundwater levels were above long-term
average depths.
Air temperatures averaged 59.9 degrees in October, 5.5 degrees
above the long-term average (Figure 1). The northeast crop reporting
district (CRD) had the lowest average temperature with 56.6 degrees. The
highest temperature was 62.8 degrees in the southwest CRD.
Precipitation averaged 2.38 inches, 0.86 inches below the long-term
average. The northeast CRD averaged 3.26 inches, the highest for the
month. The driest district was the southwest with 1.52 inches.
Soil moisture changed little overall on average in October. At the
end of the month, moisture levels averaged 0.30 water fraction by
volume (wfv) at depths of 2 inches, 0.31 wfv at 4 inches, and 0.32 wfv at
8 inches. Levels were higher at 39 and 59 inches with average values of
0.43 and 0.41 wfv, respectively.
Mean provisional streamflow aggregated statewide was above
the long-term median flow for October, about 330 percent of median
(Figure 1). Monthly mean discharge values were normal to much above
normal for October, differing by location. The Mississippi River crested
above the flood stage at most locations from Dubuque to the Illinois River
in the first half of October.
Water surface levels at the end of October were below the full
pool/seasonal target level at 12 of 24 reporting reservoirs. At the end of
October, Rend Lake was 1.7 feet above the spillway level, Carlyle Lake
was 0.5 feet above the seasonal target level, and Lake Shelbyville was
0.6 feet above the seasonal target level.
Lake Michigan’s level was above its long-term mean for the month.
Shallow groundwater levels statewide were above normal this month
with an average departure of 1.1 feet (Figure 1). A decrease of 0.2 feet
in departure was observed from the deviation in normal groundwater
levels between September and October. Levels averaged 0.4 feet below
September levels and were 0.9 feet above October levels of last year.
Figure 1
Statewide departures from normal
Water and Atmospheric Resources Monitoring Program | www.isws.illinois.edu/warm
Contact Jennie R. Atkins: (217) 333-4966, email: [email protected]
WEATHER/CLIMATE INFORMATION
Growing Degree Days (DD, base 50 degrees,
from April 1) ranged from 3300 to 4500 at the end of
October, an increase of approximately 300 DD over the
month. Totals were 200 to 400 DD above average for
most of the state.
Precipitation averaged 2.38 inches across the
state, 0.86 inches below the long-term average. Parts
of northeast and central Illinois saw heavy rainfall
during October with several stations reporting monthly
totals of over 5 inches.
Illinois has received 35.99 inches of precipitation
in 2016, 2.19 inches above the long-term average.
However, six of the last ten months have had lower
than normal averages. Only the heavy rains of July
and August, each totaling more than 3 inches above
average, give the year a wetter than normal total.
The U.S. Drought Monitor’s October 25 report listed
6.7 percent of the state as abnormally dry. Several
counties were included in the designation: Calhoun,
Pike, Scott, and Morgan counties in the west, Christian
and Shelby counties in the central region, and Pope,
Massac, Alexander, and Pulaski counties in the south.
—Jim Angel and Jennie Atkins
The following description of precipitation,
temperature, and snowfall (in winter) comes from
data compiled by a number of networks that report to
the National Oceanic and Atmospheric Administration
(NOAA). There are over 650 reporting sites in Illinois
alone. These data are provisional and may change
slightly over time.
Temperatures during October averaged
59.9 degrees, 5.5 degrees above the month’s longterm average (Table 1). This year tied 2007 for the
sixth warmest October on record. The Dixon Springs
Agricultural Center in Pope County reported an average
temperature of 65.4 degrees, 5.6 degrees above
average and one of the highest for the state. Daily
maximum temperatures reached into the low 90s with
daily lows in the 30s for most stations.
The year through October has been warm with an
average temperature of 58.0 degrees, 2.5 degrees
higher than the long-term average. Every month except
May has had above normal temperatures, making the
year the fourth warmest on record so far.
Table 1. Temperature and Precipitation for October 2016
Temperature
(°F)
Departure
from long-term average
(1981 – 2010)
Precipitation
(in)
Illinois
59.9
+5.5
2.38
CRD 1 (northwest)
57.2
+5.6
2.44
CRD 2 (northeast)
56.6
+4.5
3.26
CRD 3 (west)
59.7
+5.8
2.24
CRD 4 (central)
59.5
+5.7
2.52
CRD 5 (east)
59.0
+5.4
2.45
CRD 6 (west southwest)
61.7
+6.1
1.91
CRD 7 (east southeast)
61.0
+5.3
2.97
CRD 8 (southwest)
62.8
+5.4
1.52
CRD 9 (southeast)
62.7
+5.4
1.73
_______________
Notes:
Data from NOAA’s National Centers for Environmental Information, accessed 11/9/2016.
2
Departure
from long-term average
(1981 – 2010)
-0.86
-0.48
+0.31
-0.79
-0.57
-0.74
-1.32
-0.55
-2.19
-1.97
Figure 2a
Illinois precipitation, temperature and their departures from average for October 2016.
Source: cli-MATE, Midwestern Regional Climate Center. http://mrcc.illinois.edu/CLIMATE accessed on: November 1, 2016
Figure 2b
Illinois growing degree days and departure from average for October 2016.
Source: Midwestern Regional Climate Center. http://mrcc.illinois.edu accessed on: November 1, 2016.
3
Figure 3
Illinois precipitation and precipitation departure from average for
year to date (top), last 6 months (middle), and last 3 months (bottom)
Source: cli-MATE, Midwestern Regional Climate Center. http://mrcc.illinois.edu/CLIMATE accessed on: November 1, 2016
4
ILLINOIS CLIMATE NETWORK (ICN)
44.8 degrees at 4 inches. Temperatures under sod
ranged from 77.8 to 51.1 degrees at 4 inches and 78.7
to 51.2 degrees at 8 inches.
Precipitation averaged 2.02 inches, 0.93 inches
below the long-term average. However, totals varied
significantly across the network. Two stations,
Carbondale and Perry, had monthly totals of less than
1 inch. Peoria, in contrast, received 4.04 inches, the
highest total of the month.
Soil moisture, on average, showed little overall
change (Figure 4). Moisture levels at 2 inches averaged
0.31 water fraction by volume (wfv) on October 1 and
0.30 wfv on October 31.
Changes were seen at the regional level. At the
northern stations, soil moisture increased an average
of 24 percent at 2 inches during the month with
increases of 13 percent and 18 percent at 4 and
8 inches, respectively. However, moisture levels at
2 inches declined 20 percent in the east-central region
and 16 percent in southern regions. Similar but smaller
declines were seen at 4 and 8 inches. On average, no
significant changes occurred in the west-central region.
Moisture levels remained higher at 39 and 59 inches
with network averages on October 31 of 0.43 and
0.41 wfv, respectively.
—Jennie Atkins
The Illinois Climate Network (ICN) consists of 19
stations across the state that collect hourly weather
and soil information. ICN data for October are
presented in Table 2.
Wind speeds were higher than the long-term
average during October, averaging 6.0 mph. Speeds
were 0.5 mph below the network’s long-term average.
The Bondville station had the highest monthly average
at 10.8 mph. The month’s highest wind gust was
45.5 mph, measured at Monmouth on October 17.
Air temperatures averaged 60.8 degrees,
6.4 degrees higher than the long-term average.
Maximum temperatures were also higher than normal
with a network average of 87.4 degrees. Perry had
the month’s warmest temperature with 92.9 degrees,
reported on October 17. Minimum temperatures
reached into the 30s for all stations. The lowest
reported temperature was 30.0 degrees, measured on
October 14 at the DeKalb station.
Soil temperatures decreased 10 to 12 degrees
from September but were still 4 to 6 degrees
higher than normal across the network. Bare soil
temperatures reached into the 80s with ranges of
87.5 to 40.3 degrees at depths of 2 inches and 83.1 to
5
Table 2. Data from the Illinois Climate Network (ICN), October 2016
Station
Ave Wind
Speed
(mph)
Ave Wind
Direction
(°)
6.3
7.1
10.8
5.6
4.9
2.9
7.5
3.0
5.4
4.6
4.3
9.8
5.0
6.4
6.2
3.6
5.6
5.8
9.2 M
180.1
188.0
174.3
175.2
210.8
175.7
189.3
165.2
168.9
183.3
189.5
196.5
171.3
183.6
203.5
180.1
185.0
165.4
187.1 M
Belleville
Big Bend
Bondville
Brownstown
Carbondale
Champaign
DeKalb
Dixon Springs
Fairfield
Freeport
Kilbourne
Monmouth
Olney
Peoria
Perry
Rend Lake
Springfield
St. Charles
Stelle
Maximum
Wind Gust
(mph)
Maximum Air
Temperature
(°F)
35.7
37.0
44.0
28.5
32.6
21.8
36.3
26.6
26.4
29.8
28.6
45.5
28.0
32.9
34.2
23.2
32.4
31.3
39.5 M
Minimum Air Average Air
Temperature Temperature
(°F)
(°F)
86.9
90.8
85.1
87.4
86.8
85.6
84.3
88.3
88.4
83.4
91.5
90.5
86.1
87.9
92.9
87.9
89.0
83.1
84.3 M
36.9
33.6
31.8
36.0
35.4
33.9
30.0
35.5
35.9
33.4
33.1
30.4
34.3
37.8
34.1
36.2
39.2
31.1
33.2 M
62.7
59.4
59.2
62.7
62.9
59.1
56.3
64.3
64.5
55.9
62.0
59.3
61.9
61.6
62.6
63.6
63.2
56.1
57.7 M
Table 2 continued
Station
Belleville
Big Bend
Bondville
Brownstown
Carbondale
Champaign
DeKalb
Dixon Springs
Fairfield
Freeport
Kilbourne
Monmouth
Olney
Peoria
Perry
Rend Lake
Springfield
St. Charles
Stelle
Total Solar
Average
Radiation
Relative
(MJ/m2)
Humidity (%)
404.1
336.0
399.6
393.0
451.1
364.3
308.6
404.0
400.3
308.4
351.2
378.0
419.4
374.4
386.1
400.0
379.4
302.0
343.9 M
78.6
78.6
78.4
74.5
77.5
75.7
77.0
75.9
74.8
79.5
74.5
76.3
77.8
80.2
75.3
74.8
71.6
79.1
80.0 M
Total
Average
Precipitation Dew Point
(in)
(°F)
2.42
2.70
1.69
3.67
0.81
1.74
2.51
1.27
1.28
2.64
1.26
1.89
1.82
4.04
0.79
1.01
1.53
2.95
2.41 M
Total Potential
Evapotranspiration
(in)
55.1
51.9
51.6
53.7
54.7
50.7
48.3
55.5
55.4
49.0
52.9
51.0
54.1
54.9
53.7
54.7
53.2
49.1
51.0 M
3.3
2.72
3.19
3.20
3.55
2.70
2.46
3.16
3.30
2.25
2.90
3.15
3.24
2.89
3.25
3.16
3.16
2.29
2.70 M
_______________
Notes:
M = Missing data.
6
Ave Soil
Ave Soil
Ave Soil
Ave Soil
Temperature Temperature Temperature Temperature
at 4" under at 8" under at 2" under at 4" under
Sod (°F)
Sod (°F)
Bare Soil (°F) Bare Soil (°F)
64.6
60.6
61.7
64.3
65.2
64.1
59.9
65.0
67.0
62.1
65.9
60.8
64.9
64.4
63.1
64.7
64.4
60.3
61.0 M
64.9
61.0
61.9
63.9
65.5
64.2
58.5
66.4
67.1
60.4
63.2
60.9
65.4
60.4
63.7
65.9
63.9
60.6
61.7 M
64.4
60.6
61.2
62.5 M
63.9
62.7
59.0
66.7
66.1
57.1
63.8
60.2
63.5
60.0
66.4
65.0
62.5
58.1
63.0 M
63.1
60.4
61.4
62.7
64.5
63.3
59.2
63.5
61.3
57.3
63.9
61.2
63.7
60.6
65.5
65.5
62.7
59.2
60.2 M
Figure 4
October soil moisture levels at ICN stations.
5 cm (2 in),
10 cm (4 in), and
20 cm (8 in)
7
Figure 4
October soil moisture levels at ICN stations.
5 cm (2 in),
10 cm (4 in), and
20 cm (8 in)
8
SURFACE WATER INFORMATION
Water-Supply Lakes and Major Reservoirs.
Table 5 lists reservoirs in Illinois, their normal pool or
target water surface elevation, and other data related
to observed variations in water surface elevations.
Reservoir levels are obtained from a network of
cooperating reservoir operators who are contacted each
month by ISWS staff for current water levels. Reservoir
levels are reported in terms of their difference from
normal pool (or target level). The average of the monthend readings for the period of record is reported in
terms of the difference from normal pool or target
level (column 6 of Table 5), and the number of years of
record for each reservoir also is given (column 7). Most
reservoirs serve as public water supplies, with the
exceptions noted in the last column.
Compared to end-of-September water levels at
24 reservoirs for which levels were reported last
month and this month, reported end-of-October
water levels were lower at 9 reservoirs, higher at
11 reservoirs, and about the same as at the end of
last month at 4 reservoirs. For the 24 reservoirs with
measurements reported at the end of October, water
levels were below normal target pool or spillway level
at 12 reservoirs, at about full pool level at 6 reservoirs,
and above the seasonal target or fixed spillway levels at
6 reservoirs.
Major Reservoirs. Compared to water levels at the
end of September, at the end of October the water
level at Rend Lake was 1.6 feet lower, Carlyle Lake
was 0.4 feet higher, and the Lake Shelbyville level
was 0.3 feet higher. At the end of October, Rend Lake
was 1.7 feet above the spillway level, Carlyle Lake
was 0.5 feet above the seasonal target level, and Lake
Shelbyville was 0.6 feet above the seasonal target level.
Great Lakes. Current month mean and endof-month values are provisional and are relative to
International Great Lakes Datum 1985. The October
2016 mean level for Lake Michigan was 579.7 feet.
The monthly mean level one year ago (October 2015)
was 579.3 feet. The long-term average lake level for
October is 578.8 feet, based on 1918-2015 data. In
this period of record, the lowest mean level for Lake
Michigan for October occurred in 1964 at 576.4 feet,
and the highest level for October occurred in 1986 at
582.4 feet. The month-end level of Lake Michigan was
579.6 feet. All values are provided by the U.S. Army
Corps of Engineers Detroit District.
—Bill Saylor
River and stream discharge and stage data are
obtained from gaging stations operated by the U.S.
Geological Survey (USGS) or the U.S. Army Corps of
Engineers (USACE). The USGS gaging station network
is supported, in part, by the Illinois Department of
Natural Resources Office of Water Resources, the
Illinois State Water Survey (ISWS), and the USACE.
Provisional discharge data are obtained from the USGS.
Table 3 lists the provisional peak stage for the
current month compared to flood stage at selected
streamgaging stations located on the Illinois,
Mississippi, and Ohio Rivers. Peak stage is represented
here by morning readings posted daily by the USACE
or the National Weather Service. Flood stage is defined
locally for each gage location.
The Mississippi River crested above the flood stage
at most locations from Dubuque to the Illinois River in
the first half of October.
Provisional monthly mean flows for 26
streamgaging stations located throughout Illinois are
shown in Table 4. Mean values posted by the USGS are
listed if available; otherwise, daily mean discharge data
posted by the USGS are used to estimate the mean
flow for the month. Long-term mean flows for each
month are published by the USGS. The month’s median
flow for each station listed in Table 4 was determined
by ranking the October mean flow for each year of
record, and selecting the middle value, 50 percent
exceedence probability.
The statewide percent of historical mean flow
and percent of historical median flow are calculated
by dividing the sum of the average flows this month
at stations in Table 4 by the sum of the historical
mean and median flows calculated for the month,
respectively, at the same stations. This method
is intended to weight individual observations
proportionately in the aggregate comparison. (The
Illinois River and Rock River stations are excluded from
the statewide calculation because other rivers listed in
Table 4 contribute to their flow.)
Mean provisional flow aggregated statewide was
well above the median value for October (approximately
330 percent of the median) and above the long-term
mean for the month (about 150 percent of the mean).
Monthly mean discharge values were normal to much
above normal for October, differing by location.
9
Table 3. Peak Stages for Major Rivers during October 2016
River
River
mile*
Flood stage
(feet)*
Morris
La Salle
Peoria
Havana
Beardstown
Hardin
263.1
224.7
164.6
119.6
88.6
21.5
16
20
18
14
14
25
8.8
16.5
12.7
11.9
11.0
24.2
07
08
various
10
10-11
09-10
Dubuque
Keokuk
Quincy
Grafton
St. Louis
Chester
Thebes
579.9
364.2
327.9
218.0
180.0
109.9
43.7
17
16
17
18
30
27
33
17.7
16.6
19.6
19.3
21.8
23.7
26.1
01
06
07
09
10-11
11
12
Station
Peak stage
(feet)**
Date
Illinois
Mississippi
Ohio
Cairo
2.0
40
23.7
12-13
________________
Notes:
* River mile and flood stage from River Stages in Illinois: Flood and Damage Data, Illinois Department of Natural Resources, Office of Water
Resources, August 2004 (and Addendum, February 2007).
**Peak stage based on daily a.m. readings, not instantaneous peak. Stage data obtained from U.S. Army Corps of Engineers.
Table 4. Provisional Mean Flows, October 2016
Station
Drainage
area
(sq mi)
Years
of
record
2016
mean flow
(cfs)
Long-term flows
Mean*
Median
(cfs)
(cfs)
Flow condition
Rock River at Rockton
6363
81
6123
3174
2928
much above normal
Rock River near Joslin
9549
73
8138
4605
4210
above normal
Pecatonica River at Freeport
1326
97
1228
716
627
above normal
Green River near Geneseo
1003
77
487
378
213
above normal
Edwards River near New Boston
445
78
194
138
47
above normal
Kankakee River at Momence
2294
98
2825
1248
922
much above normal
Iroquois River near Chebanse
2091
92
956
738
193
above normal
Fox River at Dayton
2642
96
1542
1155
867
above normal
Vermilion River at Pontiac
579
72
317
153
20
above normal
Spoon River at Seville
1636
99
562
518
181
above normal
LaMoine River at Ripley
1293
92
237
434
114
normal
Bear Creek near Marceline
349
71
14
123
13
normal
Mackinaw River near Congerville
767
67
762
204
30
much above normal
Salt Creek near Greenview
1804
74
681
549
213
above normal
Sangamon River at Monticello
550
103
149
174
34
above normal
South Fork Sangamon near Rochester
867
66
25
212
25
normal
Illinois River at Valley City
26,743
77
19,150
12,850
8046
above normal
Macoupin Creek near Kane
868
87
126
265
43
above normal
Vermilion River near Danville
1290
94
422
365
104
above normal
Kaskaskia River at Vandalia
1940
46
619
591
191
above normal
Shoal Creek near Breese
735
72
454
188
46
above normal
Embarras River at Ste. Marie
1516
102
731
431
103
above normal
Skillet Fork at Wayne City
464
96
46
108
12
normal
Little Wabash below Clay City
1131
101
696
233
51
above normal
Big Muddy at Plumfield
794
45
489
143
62
much above normal
Cache River at Forman
244
92
5.9
62
17
normal
________________
Notes:
Source streamflow data are obtained from the U.S. Geological Survey.
N/A = not available (due to ice or equipment problems).
Much below normal flow = 90-100% chance of exceedence.
Below normal flow = 70-90% chance of exceedence.
Normal flow = 30-70% chance of exceedence.
Above normal flow = 10-30% chance of exceedence.
Much above normal flow = 0-10% chance of exceedence.
*As reported in U.S. Geological Survey (USGS) Water Resources Data, Illinois, Water Year 2015.
10
Percent
Days of
chance of data this
exceedence month
10
15
14
22
20
9
19
26
15
22
35
49
10
21
24
50
20
25
22
29
16
16
31
12
4
67
31
31
31
31
31
31
31
31
31
31
31
31
31
31
31
31
31
31
31
31
31
31
31
31
31
31
Table 5. Reservoir Levels in Illinois, October 2016
Reservoir
County
Normal pool
or target
level (feet)
Current level
difference from normal
or target (feet)
Monthly
change
(feet)
Average difference
from normal
or target (feet)
Years
of
record
September
reported pumpage
(million gallons)
Altamont
Effingham
582.0
-0.1
+0.2
-2.7
32
6.0
Bloomington
McLean
719.5
+0.3
+0.2
-4.0
28
N/A
Carlinville
Macoupin
571.1
-0.3
-0.2
-1.5
33
25.6
Carlyle(1)
Clinton
445.0
+0.5
+0.4
+0.1
38
N/A
Decatur(1,3)
Macon
614.3
+0.1
+0.1
-1.4
33
965.0
Evergreen(4)
Woodford
720.0
0.0
+0.5
-3.2
25
N/A
Glenn Shoals(2)
Montgomery
590.0
0.0
0.0
-1.0
21
w/Hillsboro
Greenfield
Greene
566.2
N/A
N/A
-1.2
21
N/A
Highland
Madison
500.0
0.0
0.0
-0.6
28
30.9
Hillsboro(2)
Montgomery
589.0
0.0
0.0
-0.4
21
25.9
Jacksonville(2)
Morgan
644.0
N/A
N/A
-0.8
17
w/Mauvaise Terre
Kinkaid
Jackson
420.0
-0.6
-0.3
-0.7
28
54.0
Lake of Egypt
Williamson
500.0
-0.9
-0.9
-1.5
21
N/A
Mattoon
Coles
632.0
-1.0
-0.6
-0.8
21
w/Paradise
Mauvaise Terre(2)
Morgan
588.5
N/A
N/A
-0.2
19
no meter
Mt. Olive (new)
Macoupin
600.0
N/A
N/A
-0.6
6
w/Mt. Olive (old)
Mt. Olive (old)
Macoupin
654.0
-0.5
+0.1
-1.4
19
5.0
Pana
Christian
641.6
-0.6
-0.4
-1.9
30
N/A
Paradise
Coles
685.0
-0.7
+1.8
-0.6
24
67.7
Paris (east)
Edgar
660.0
N/A
N/A
-1.2
30
Not PWS
Paris (west)
Edgar
660.1
N/A
N/A
0.0
20
w/Paris (east)
Raccoon(1)
Marion
477.0
+0.1
-0.3
N/A
N/A
112.1
Rend
Franklin
405.0
+1.7
-1.6
+0.2
38
N/A
Salem(3)
Marion
546.5
-0.7
-0.5
-0.8
20
24.9
Shelbyville(1)
Shelby
599.7
+0.6
+0.3
-0.1
38
Not PWS
Sparta(3)
Randolph
497.0
-0.8
+1.3
-1.5
17
N/A
Spring(3,4)
McDonough
654.0
0.0
+0.1
-1.0
33
48.9
Springfield(1,3)
Sangamon
560.0
-0.6
-0.2
-2.3
33
693.0
Taylorville
Christian
590.0
-0.2
0.0
-0.9
23
56.4
Vermilion(4)
Vermilion
581.7
0.0
+0.1
-0.8
31
190.2
_______________
Notes:
Normal pool and target level datum is NGVD 1929.
Current levels reported represent water surface levels at the end of the month, not the monthly average.
Average difference from normal or target level is the arithmetic average of reported month-end values for the period of record indicated.
Years of record = total number of monthly readings included in month-end average. Total period of record may be longer.
Not PWS = not a public water supply.
N/A = not available.
(1)
Target operating level may vary. Seasonal target levels this month represent November 1 values.
(2)
Instrumentation not available to measure height of water elevation above spillway.
(3)
Natural inflow can be supplemented by other sources.
(4)
Normal pool elevations have changed during period of record reported.
11
GROUNDWATER INFORMATION
month. Levels averaged 0.4 feet below and ranged
from 2.5 feet below to 0.9 feet above levels of
September.
Comparison to Same Month, Previous Year.
Shallow groundwater levels in October were above
levels measured one year ago. Levels averaged 0.9 feet
above this month and ranged from 1.3 feet below to
6.0 feet above levels of October 2015.
—Ken Hlinka
Comparison to Average Levels. Shallow
groundwater levels in 15 observation wells, which are
remote from pumping centers, were above normal for
the month of October. Levels averaged 1.1 feet above
and ranged from 1.4 feet below to 3.2 feet above
normal levels (Table 6).
Comparison to Previous Month. Shallow
groundwater levels were below those of the previous
Table 6. Month-End Shallow Groundwater Level Data Sites, October 2016
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Well name
Galena
Mt. Morris
Crystal Lake
Fermi Lab
Good Hope
Snicarte
Coffman
Greenfield
Janesville
St. Peter
SWS #2
Boyleston
Sparta
SE College
Bondville
_______________
Notes:
N/A = Data not available.
County
JoDaviess
Ogle
McHenry
DuPage
McDonough
Mason
Pike
Greene
Coles
Fayette
St. Clair
Wayne
Randolph
Saline
Champaign
Well depth
(feet)
25.00
55.00
18.00
17.00
30.00
42.00
28.00
20.70
11.00
15.00
80.00
23.00
27.00
11.00
21.00
Deviation from
This month’s reading 15-year avg. Period of record
Previous
(depth to water, feet) level (feet)
avg. (feet)
month (feet)
Previous
year (feet)
19.64
17.77
5.26
8.19
7.04
36.62
15.37
14.72
5.72
2.41
12.40
7.20
8.24
6.22
4.84
+0.90
+3.33
+0.24
+0.31
+1.48
+1.48
-2.35
+0.19
+0.36
+1.22
+1.63
-0.40
+0.35
+1.44
+1.54
+1.53
+2.17
+0.45
-0.37
+2.73
+1.32
-1.35
+0.54
+0.54
+1.64
+3.24
+0.17
+1.64
+1.28
+1.04
-0.03
-1.38
-0.21
-0.15
-0.92
+0.11
-0.95
-0.64
+0.61
+0.90
NA
-0.02
-2.46
-1.06
+0.10
+1.47
+6.01
-0.13
+0.21
-0.81
+0.98
-1.26
NA
+0.38
+1.17
+1.01
+0.44
+0.77
+2.16
+0.43
Averages
+0.78
+1.10
-0.44
+0.92
12
ADDENDUM
average of 1.44 inches is about 52 percent of the
23-year (1993-2015) IVWA October network average of
2.76 inches.
Cook County. The October 2016 total precipitation
was normal (Figure 5b). Precipitation amounts were
highest in the central portion of the network and
lowest along the central-west edge of the network.
Precipitation values ranged from 4.23 inches at Site
#17 (Alsip) to 2.43 inches at Site #5 (Franklin Park).
The October 2016 network average of 3.22 inches is
about 104 percent of the 26-year (1990 –2015) October
network average of 3.08 inches.
—Erin Bauer
Imperial Valley. Precipitation during October 2016
was well below average (Figure 5a). Monthly gage
totals were largest along the northwestern edge of
the network, north of Havana, IL. The smallest gage
totals were in south-central Mason County. Individual
gage amounts ranged from 0.56 inches at site #20 to
2.80 inches at site #8, northeast of Havana, IL. The
1981-2010, 30-year average precipitation amounts
for October at Havana and Mason City are 3.04 and
2.87 inches, respectively. The October 2016 network
0TWLYPHS=HSSL`>H[LY(\[OVYP[`
7YLJPWP[H[PVUPUJOLZ
6J[VILY
a. Imperial Valley
:JHSLVM4PSLZ
b. Cook County
6J[VILY
Figure 5
Long-term raingage network precipitation totals (inches) for October 2016
Data sources for information in this publication include the following:
CPC - Climate Prediction Center, http://www.cpc.ncep.noaa.gov/index.php
ISWS - Illinois State Water Survey, http://www.isws.illinois.edu
MRCC - Midwestern Regional Climate Center, http://mrcc.isws.illinois.edu
NCDC - National Climatic Data Center, http://www.ncdc.noaa.gov
NWS - National Weather Service, http://www.nws.noaa.gov
USACE - U.S. Army Corps of Engineers, http://rivergages.com, http://www.lre.usace.army.mil/greatlakes/hh
USGS - U.S. Geological Survey, http://waterdata.usgs.gov/il/nwis
WARM - Water and Atmospheric Resources Monitoring Program, http://www.isws.illinois.edu/warm
13
Illinois State Water Survey
2204 Griffith Drive • Champaign, IL 61820
Tel (217) 333-2210 • www.isws.illinois.edu