Viewing Station: VA-FX-139 : Herndon 3.8 SSW
Sep 1, 2025 - Sep 23, 2026382 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 4.43"
September 1-23, 2026(17 of 23 days covered by obs)
NOAA Normal
3.10"
Departure from Normal
1.33" : 143% of Normal
Year-To-Date: 39.70"
Jan 1 to Sep 23, 2026(260 of 266 days covered by obs)
NOAA Normal
31.51"
Departure from Normal
8.19" : 126% of Normal
Water Year-To-Date: 44.62"
Oct 1, 2025 to Sep 23, 2026(352 of 358 days covered by obs)
NOAA Normal
41.64"
Departure from Normal
2.98" : 107% 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