Viewing Station: IL-SC-47 : O'Fallon 1.8 N
Mar 26, 2025 - May 27, 2026426 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 4.28"
May 1-27, 2026(27 of 27 days covered by obs)
NOAA Normal
4.33"
Departure from Normal
-0.05" : 99% of Normal
Year-To-Date: 16.36"
Jan 1 to May 27, 2026(147 of 147 days covered by obs)
NOAA Normal
17.42"
Departure from Normal
-1.06" : 94% of Normal
Water Year-To-Date: 23.81"
Oct 1, 2025 to May 27, 2026(239 of 239 days covered by obs)
NOAA Normal
26.69"
Departure from Normal
-2.88" : 89% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
2.58
2.78
-0.20
Feb
2.21
2.37
-0.16
Mar
3.45
3.50
-0.05
Apr
4.85
4.87
-0.02
May
4.97
5.06
-0.09
Jun
4.37
4.65
-0.28
Jul
3.96
4.23
-0.27
Aug
3.32
3.64
-0.32
Sep
3.33
3.31
0.02
Oct
3.17
3.14
0.03
Nov
3.46
3.64
-0.18
Dec
2.64
2.70
-0.06
42.31
43.89
-1.58