Viewing Station: MO-SS-43 : O'Fallon 3.9 NNW
Mar 18, 2020 - May 19, 20262,194 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 4.42"
May 1-19, 2026(19 of 19 days covered by obs)
NOAA Normal
2.99"
Departure from Normal
1.43" : 148% of Normal
Year-To-Date: 18.72"
Jan 1 to May 19, 2026(139 of 139 days covered by obs)
NOAA Normal
15.64"
Departure from Normal
3.08" : 120% of Normal
Water Year-To-Date: 24.52"
Oct 1, 2025 to May 19, 2026(231 of 231 days covered by obs)
NOAA Normal
24.61"
Departure from Normal
-0.09" : 100% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
2.42
2.46
-0.04
Feb
2.17
2.24
-0.07
Mar
3.42
3.31
0.11
Apr
4.64
4.54
0.10
May
4.88
5.01
-0.13
Jun
4.46
4.44
0.02
Jul
3.76
3.88
-0.12
Aug
3.66
3.49
0.17
Sep
3.33
3.26
0.07
Oct
3.11
3.22
-0.11
Nov
3.34
3.39
-0.05
Dec
2.52
2.60
-0.08
41.71
41.84
-0.13