Viewing Station: IL-LS-1 : Ottawa 1.3 NW
Dec 8, 2006 - Sep 16, 20257,073 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.44"
September 1-16, 2025(16 of 16 days covered by obs)
NOAA Normal
1.71"
Departure from Normal
-1.27" : 26% of Normal
Year-To-Date: 23.40"
Jan 1 to Sep 16, 2025(259 of 259 days covered by obs)
NOAA Normal
27.40"
Departure from Normal
-4.00" : 85% of Normal
Water Year-To-Date: 29.46"
Oct 1, 2024 to Sep 16, 2025(351 of 351 days covered by obs)
NOAA Normal
34.88"
Departure from Normal
-5.42" : 84% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
1.92
1.90
0.02
Feb
1.75
1.79
-0.04
Mar
2.24
2.38
-0.14
Apr
3.53
3.53
0.00
May
4.47
4.56
-0.09
Jun
4.37
4.43
-0.06
Jul
3.77
3.78
-0.01
Aug
3.64
3.74
-0.10
Sep
3.21
3.29
-0.08
Oct
3.06
3.11
-0.05
Nov
2.46
2.61
-0.15
Dec
1.96
2.06
-0.10
36.38
37.18
-0.80