Viewing Station: MT-LC-14 : Helena 2.0 NNW
Jun 15, 2013 - May 18, 20265,062 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.15"
May 1-18, 2026(18 of 18 days covered by obs)
NOAA Normal
1.22"
Departure from Normal
-1.07" : 12% of Normal
Year-To-Date: 3.64"
Jan 1 to May 18, 2026(138 of 138 days covered by obs)
NOAA Normal
4.16"
Departure from Normal
-0.52" : 88% of Normal
Water Year-To-Date: 6.96"
Oct 1, 2025 to May 18, 2026(229 of 230 days covered by obs)
NOAA Normal
6.33"
Departure from Normal
0.63" : 110% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
0.39
0.45
-0.06
Feb
0.46
0.47
-0.01
Mar
0.73
0.56
0.17
Apr
1.36
1.05
0.31
May
2.10
1.89
0.21
Jun
2.39
2.25
0.14
Jul
1.17
1.10
0.07
Aug
1.08
1.10
-0.02
Sep
1.15
1.00
0.15
Oct
0.99
0.89
0.10
Nov
0.69
0.58
0.11
Dec
0.49
0.49
0.00
13.00
11.83
1.17