Viewing Station: IL-SG-11 : Chatham 1.4 ESE
Jan 13, 2007 - Sep 4, 20255,584 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.03"
September 1-18, 2025(4 of 18 days covered by obs)
NOAA Normal
1.87"
Departure from Normal
-1.84" : 2% of Normal
Year-To-Date: 20.58"
Jan 1 to Sep 18, 2025(246 of 261 days covered by obs)
NOAA Normal
28.98"
Departure from Normal
-8.40" : 71% of Normal
Water Year-To-Date: 30.62"
Oct 1, 2024 to Sep 18, 2025(338 of 353 days covered by obs)
NOAA Normal
37.32"
Departure from Normal
-6.70" : 82% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
2.15
2.14
0.01
Feb
2.00
1.93
0.07
Mar
2.75
2.71
0.04
Apr
4.18
4.06
0.12
May
4.49
4.60
-0.11
Jun
4.38
4.41
-0.03
Jul
3.75
3.54
0.21
Aug
3.41
3.10
0.31
Sep
3.12
3.12
0.00
Oct
3.15
3.10
0.05
Nov
3.04
2.97
0.07
Dec
2.15
2.17
-0.02
38.57
37.85
0.72