Viewing Station: MT-LC-4 : Helena 10.6 N
Aug 23, 2007 - Oct 21, 20256,049 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.70"
October 1-21, 2025(21 of 21 days covered by obs)
NOAA Normal
0.48"
Departure from Normal
0.22" : 146% of Normal
Year-To-Date: 9.47"
Jan 1 to Oct 21, 2025(293 of 294 days covered by obs)
NOAA Normal
9.70"
Departure from Normal
-0.23" : 98% of Normal
Water Year-To-Date: 0.70"
Oct 1, 2025 to Oct 21, 2025(21 of 21 days covered by obs)
NOAA Normal
0.48"
Departure from Normal
0.22" : 146% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
0.28
0.42
-0.14
Feb
0.33
0.46
-0.13
Mar
0.47
0.54
-0.07
Apr
1.08
1.11
-0.03
May
1.78
1.96
-0.18
Jun
2.26
2.40
-0.14
Jul
1.04
1.06
-0.02
Aug
1.01
0.98
0.03
Sep
0.97
1.04
-0.07
Oct
0.71
0.87
-0.16
Nov
0.43
0.65
-0.22
Dec
0.37
0.47
-0.10
10.73
11.96
-1.23