Viewing Station: IL-LS-17 : Ottawa 1.6 N
May 15, 2007 - May 27, 20266,971 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 2.42"
May 1-27, 2026(27 of 27 days covered by obs)
NOAA Normal
3.89"
Departure from Normal
-1.47" : 62% of Normal
Year-To-Date: 14.80"
Jan 1 to May 27, 2026(147 of 147 days covered by obs)
NOAA Normal
13.33"
Departure from Normal
1.47" : 111% of Normal
Water Year-To-Date: 21.46"
Oct 1, 2025 to May 27, 2026(239 of 239 days covered by obs)
NOAA Normal
20.81"
Departure from Normal
0.65" : 103% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
1.92
1.91
0.01
Feb
1.75
1.80
-0.05
Mar
2.24
2.38
-0.14
Apr
3.53
3.53
0.00
May
4.47
4.56
-0.09
Jun
4.37
4.45
-0.08
Jul
3.77
3.79
-0.02
Aug
3.64
3.75
-0.11
Sep
3.21
3.30
-0.09
Oct
3.06
3.12
-0.06
Nov
2.46
2.61
-0.15
Dec
1.96
2.07
-0.11
36.38
37.27
-0.89