Viewing Station: IA-IA-21 : Williamsburg 0.6 SW
Mar 25, 2023 - May 20, 20261,110 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 3.05"
May 1-20, 2026(20 of 20 days covered by obs)
NOAA Normal
3.01"
Departure from Normal
0.04" : 101% of Normal
Year-To-Date: 12.02"
Jan 1 to May 20, 2026(137 of 140 days covered by obs)
NOAA Normal
11.33"
Departure from Normal
0.69" : 106% of Normal
Water Year-To-Date: 16.14"
Oct 1, 2025 to May 20, 2026(227 of 232 days covered by obs)
NOAA Normal
17.84"
Departure from Normal
-1.70" : 90% 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