Viewing Station: VA-FX-139 : Herndon 3.8 SSW
Sep 1, 2025 - May 20, 2026209 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 1.06"
May 1-20, 2026(6 of 20 days covered by obs)
NOAA Normal
2.72"
Departure from Normal
-1.66" : 39% of Normal
Year-To-Date: 12.94"
Jan 1 to May 20, 2026(87 of 140 days covered by obs)
NOAA Normal
15.03"
Departure from Normal
-2.09" : 86% of Normal
Water Year-To-Date: 17.86"
Oct 1, 2025 to May 20, 2026(179 of 232 days covered by obs)
NOAA Normal
25.16"
Departure from Normal
-7.30" : 71% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
2.96
3.06
-0.10
Feb
2.54
2.63
-0.09
Mar
3.50
3.77
-0.27
Apr
3.31
3.39
-0.08
May
4.21
4.55
-0.34
Jun
4.14
4.37
-0.23
Jul
4.24
4.28
-0.04
Aug
3.50
3.65
-0.15
Sep
4.05
4.25
-0.20
Oct
3.69
3.82
-0.13
Nov
3.03
3.20
-0.17
Dec
3.41
3.52
-0.11
42.58
44.49
-1.91