Viewing Station: CO-BO-4 : Boulder 2.9 S
Jun 1, 2001 - Sep 18, 20269,352 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.29"
September 1-18, 2026(18 of 18 days covered by obs)
NOAA Normal
0.92"
Departure from Normal
-0.63" : 32% of Normal
Year-To-Date: 8.88"
Jan 1 to Sep 18, 2026(261 of 261 days covered by obs)
NOAA Normal
15.35"
Departure from Normal
-6.47" : 58% of Normal
Water Year-To-Date: 10.31"
Oct 1, 2025 to Sep 18, 2026(353 of 353 days covered by obs)
NOAA Normal
18.49"
Departure from Normal
-8.18" : 56% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
0.71
0.74
-0.03
Feb
0.91
0.90
0.01
Mar
1.84
1.85
-0.01
Apr
2.72
2.79
-0.07
May
2.80
3.06
-0.26
Jun
1.88
1.92
-0.04
Jul
1.84
1.73
0.11
Aug
1.73
1.65
0.08
Sep
1.53
2.05
-0.52
Oct
1.37
1.54
-0.17
Nov
1.06
1.04
0.02
Dec
0.71
0.76
-0.05
19.10
20.03
-0.93