Viewing Station: MT-LC-11 : Helena 9.3 NNE
May 22, 2012 - Oct 12, 2025482 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.26"
October 1-13, 2025(5 of 13 days covered by obs)
NOAA Normal
0.36"
Departure from Normal
-0.10" : 72% of Normal
Year-To-Date: 6.03"
Jan 1 to Oct 13, 2025(50 of 286 days covered by obs)
NOAA Normal
10.30"
Departure from Normal
-4.27" : 59% of Normal
Water Year-To-Date: 0.26"
Oct 1, 2025 to Oct 13, 2025(5 of 13 days covered by obs)
NOAA Normal
0.36"
Departure from Normal
-0.10" : 72% 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