Viewing Station: IA-IA-21 : Williamsburg 0.6 SW
Mar 25, 2023 - Sep 15, 2025868 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.22"
September 1-15, 2025(15 of 15 days covered by obs)
NOAA Normal
1.73"
Departure from Normal
-1.51" : 13% of Normal
Year-To-Date: 31.54"
Jan 1 to Sep 15, 2025(256 of 258 days covered by obs)
NOAA Normal
28.04"
Departure from Normal
3.50" : 113% of Normal
Water Year-To-Date: 40.34"
Oct 1, 2024 to Sep 15, 2025(348 of 350 days covered by obs)
NOAA Normal
34.54"
Departure from Normal
5.80" : 117% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
1.09
1.13
-0.04
Feb
1.38
1.38
0.00
Mar
2.12
2.15
-0.03
Apr
3.73
3.58
0.15
May
4.66
4.82
-0.16
Jun
5.11
4.84
0.27
Jul
4.10
4.23
-0.13
Aug
4.11
4.26
-0.15
Sep
3.47
3.52
-0.05
Oct
2.93
2.78
0.15
Nov
2.08
2.09
-0.01
Dec
1.50
1.64
-0.14
36.28
36.42
-0.14