Viewing Station: IL-LK-39 : Riverwoods 0.4 ENE
Apr 12, 2008 - Sep 18, 20255,846 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 1.51"
September 1-18, 2025(17 of 18 days covered by obs)
NOAA Normal
2.00"
Departure from Normal
-0.49" : 75% of Normal
Year-To-Date: 21.42"
Jan 1 to Sep 18, 2025(255 of 261 days covered by obs)
NOAA Normal
27.96"
Departure from Normal
-6.54" : 77% of Normal
Water Year-To-Date: 27.83"
Oct 1, 2024 to Sep 18, 2025(347 of 353 days covered by obs)
NOAA Normal
35.66"
Departure from Normal
-7.83" : 78% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
1.88
1.98
-0.10
Feb
1.77
1.90
-0.13
Mar
2.22
2.26
-0.04
Apr
3.74
3.70
0.04
May
4.32
4.44
-0.12
Jun
4.47
4.25
0.22
Jul
3.78
3.62
0.16
Aug
3.78
3.80
-0.02
Sep
3.34
3.31
0.03
Oct
3.20
3.28
-0.08
Nov
2.45
2.41
0.04
Dec
2.05
2.09
-0.04
37.00
37.04
-0.04