Viewing Station: MT-LC-11 : Helena 9.3 NNE
May 22, 2012 - Sep 2, 2026501 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.12"
September 1-2, 2026(2 of 2 days covered by obs)
NOAA Normal
0.07"
Departure from Normal
0.05" : 171% of Normal
Year-To-Date: 4.31"
Jan 1 to Sep 2, 2026(39 of 245 days covered by obs)
NOAA Normal
8.96"
Departure from Normal
-4.65" : 48% of Normal
Water Year-To-Date: 4.57"
Oct 1, 2025 to Sep 2, 2026(44 of 337 days covered by obs)
NOAA Normal
10.68"
Departure from Normal
-6.11" : 43% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
0.31
0.37
-0.06
Feb
0.38
0.39
-0.01
Mar
0.54
0.43
0.11
Apr
1.19
0.91
0.28
May
1.99
1.75
0.24
Jun
2.37
2.27
0.10
Jul
1.07
0.97
0.10
Aug
1.04
0.99
0.05
Sep
1.05
0.90
0.15
Oct
0.86
0.70
0.16
Nov
0.47
0.54
-0.07
Dec
0.39
0.41
-0.02
11.66
10.63
1.03