Viewing Station: IL-LS-1 : Ottawa 1.3 NW
Dec 8, 2006 - May 18, 20267,346 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 1.00"
May 1-18, 2026(18 of 18 days covered by obs)
NOAA Normal
2.60"
Departure from Normal
-1.60" : 39% of Normal
Year-To-Date: 13.70"
Jan 1 to May 18, 2026(138 of 138 days covered by obs)
NOAA Normal
12.04"
Departure from Normal
1.66" : 114% of Normal
Water Year-To-Date: 19.98"
Oct 1, 2025 to May 18, 2026(230 of 230 days covered by obs)
NOAA Normal
19.52"
Departure from Normal
0.46" : 102% 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