Viewing Station: IL-LK-22 : Lake Forest 2.1 NNE
Aug 1, 2007 - Sep 21, 20266,870 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 4.65"
September 1-22, 2026(21 of 22 days covered by obs)
NOAA Normal
2.48"
Departure from Normal
2.17" : 188% of Normal
Year-To-Date: 35.14"
Jan 1 to Sep 22, 2026(264 of 265 days covered by obs)
NOAA Normal
27.96"
Departure from Normal
7.18" : 126% of Normal
Water Year-To-Date: 42.69"
Oct 1, 2025 to Sep 22, 2026(356 of 357 days covered by obs)
NOAA Normal
35.65"
Departure from Normal
7.04" : 120% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
1.87
1.95
-0.08
Feb
1.74
1.89
-0.15
Mar
2.21
2.27
-0.06
Apr
3.75
3.77
-0.02
May
4.23
4.35
-0.12
Jun
4.36
4.19
0.17
Jul
3.61
3.62
-0.01
Aug
3.71
3.61
0.10
Sep
3.38
3.63
-0.25
Oct
3.24
3.37
-0.13
Nov
2.46
2.46
0.00
Dec
1.99
2.09
-0.10
36.55
37.20
-0.65