Viewing Station: CO-BO-437 : Boulder 2.1 W
Jun 23, 2017 - Sep 15, 20263,069 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.60"
September 1-15, 2026(15 of 15 days covered by obs)
NOAA Normal
0.77"
Departure from Normal
-0.17" : 78% of Normal
Year-To-Date: 8.01"
Jan 1 to Sep 15, 2026(251 of 258 days covered by obs)
NOAA Normal
14.63"
Departure from Normal
-6.62" : 55% of Normal
Water Year-To-Date: 9.45"
Oct 1, 2025 to Sep 15, 2026(342 of 350 days covered by obs)
NOAA Normal
17.63"
Departure from Normal
-8.18" : 54% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
0.65
0.74
-0.09
Feb
0.85
0.98
-0.13
Mar
1.74
1.87
-0.13
Apr
2.56
2.82
-0.26
May
2.76
3.24
-0.48
Jun
1.86
2.13
-0.27
Jul
1.77
1.71
0.06
Aug
1.67
1.62
0.05
Sep
1.53
2.08
-0.55
Oct
1.36
1.61
-0.25
Nov
1.00
1.07
-0.07
Dec
0.65
0.78
-0.13
18.40
20.65
-2.25