Viewing Station: IL-CK-464 : Oak Park 1.5 S
Mar 31, 2026 - Sep 20, 2026156 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 3.15"
September 1-22, 2026(20 of 22 days covered by obs)
NOAA Normal
2.39"
Departure from Normal
0.76" : 132% of Normal
Year-To-Date: 30.11"
Jan 1 to Sep 22, 2026(158 of 265 days covered by obs)
NOAA Normal
28.67"
Departure from Normal
1.44" : 105% of Normal
Water Year-To-Date: 30.11"
Oct 1, 2025 to Sep 22, 2026(158 of 357 days covered by obs)
NOAA Normal
36.70"
Departure from Normal
-6.59" : 82% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
1.98
2.17
-0.19
Feb
1.79
1.99
-0.20
Mar
2.29
2.33
-0.04
Apr
3.78
3.88
-0.10
May
4.50
4.53
-0.03
Jun
4.27
4.36
-0.09
Jul
3.68
3.78
-0.10
Aug
3.99
4.01
-0.02
Sep
3.26
3.22
0.04
Oct
3.44
3.56
-0.12
Nov
2.50
2.67
-0.17
Dec
2.09
2.26
-0.17
37.57
38.76
-1.19