Viewing Station: MT-LC-11 : Helena 9.3 NNE
May 22, 2012 - May 6, 2025455 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.84"
May 1-6, 2025(2 of 6 days covered by obs)
NOAA Normal
0.39"
Departure from Normal
0.45" : 218% of Normal
Year-To-Date: 1.64"
Jan 1 to May 6, 2025(8 of 126 days covered by obs)
NOAA Normal
2.81"
Departure from Normal
-1.17" : 58% of Normal
Water Year-To-Date: 1.66"
Oct 1, 2024 to May 6, 2025(9 of 218 days covered by obs)
NOAA Normal
4.53"
Departure from Normal
-2.87" : 37% 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