Viewing Station: CA-SM-46 : San Mateo 0.1 S
Dec 30, 2021 - Dec 31, 2025566 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 3.86"
December 1-31, 2025(30 of 31 days covered by obs)
NOAA Normal
3.98"
Departure from Normal
-0.12" : 97% of Normal
Year-To-Date: 17.44"
Jan 1 to Dec 31, 2025(179 of 365 days covered by obs)
NOAA Normal
19.96"
Departure from Normal
-2.52" : 87% of Normal
Water Year-To-Date: 8.80"
Oct 1, 2025 to Dec 31, 2025(68 of 92 days covered by obs)
NOAA Normal
6.83"
Departure from Normal
1.97" : 129% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
3.97
3.63
0.34
Feb
3.88
3.59
0.29
Mar
2.96
2.80
0.16
Apr
1.40
1.44
-0.04
May
0.64
0.57
0.07
Jun
0.15
0.15
0.00
Jul
0.01
0.02
-0.01
Aug
0.04
0.05
-0.01
Sep
0.08
0.07
0.01
Oct
0.92
0.82
0.10
Nov
1.93
1.75
0.18
Dec
3.98
3.99
-0.01
19.96
18.88
1.08