Viewing Station: IL-CK-74 : Oak Park 1.3 NNE
Jul 9, 2007 - Sep 20, 20266,635 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 3.72"
September 1-20, 2026(20 of 20 days covered by obs)
NOAA Normal
2.17"
Departure from Normal
1.55" : 172% of Normal
Year-To-Date: 36.85"
Jan 1 to Sep 20, 2026(263 of 263 days covered by obs)
NOAA Normal
28.37"
Departure from Normal
8.48" : 130% of Normal
Water Year-To-Date: 44.21"
Oct 1, 2025 to Sep 20, 2026(354 of 355 days covered by obs)
NOAA Normal
36.37"
Departure from Normal
7.84" : 122% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
1.97
2.16
-0.19
Feb
1.81
1.98
-0.17
Mar
2.29
2.31
-0.02
Apr
3.76
3.88
-0.12
May
4.47
4.56
-0.09
Jun
4.28
4.35
-0.07
Jul
3.67
3.74
-0.07
Aug
3.95
3.99
-0.04
Sep
3.25
3.23
0.02
Oct
3.43
3.58
-0.15
Nov
2.49
2.67
-0.18
Dec
2.08
2.26
-0.18
37.45
38.71
-1.26