Viewing Station: MT-LC-11 : Helena 9.3 NNE
May 22, 2012 - Sep 1, 2025476 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.09"
September 1-13, 2025(1 of 13 days covered by obs)
NOAA Normal
0.46"
Departure from Normal
-0.37" : 20% of Normal
Year-To-Date: 5.37"
Jan 1 to Sep 13, 2025(40 of 256 days covered by obs)
NOAA Normal
9.34"
Departure from Normal
-3.97" : 57% of Normal
Water Year-To-Date: 5.39"
Oct 1, 2024 to Sep 13, 2025(41 of 348 days covered by obs)
NOAA Normal
11.07"
Departure from Normal
-5.68" : 49% 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