Viewing Station: CA-AL-43 : Castro Valley 1.7 WNW
Oct 2, 2018 - Dec 22, 2025441 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 1.41"
December 1-22, 2025(22 of 22 days covered by obs)
NOAA Normal
2.80"
Departure from Normal
-1.39" : 50% of Normal
Year-To-Date: 15.36"
Jan 1 to Dec 22, 2025(331 of 356 days covered by obs)
NOAA Normal
19.00"
Departure from Normal
-3.64" : 81% of Normal
Water Year-To-Date: 6.64"
Oct 1, 2025 to Dec 22, 2025(83 of 83 days covered by obs)
NOAA Normal
5.82"
Departure from Normal
0.82" : 114% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
3.86
4.42
-0.56
Feb
3.79
4.31
-0.52
Mar
3.00
3.53
-0.53
Apr
1.51
1.80
-0.29
May
0.72
0.83
-0.11
Jun
0.15
0.24
-0.09
Jul
0.01
0.01
0.00
Aug
0.03
0.05
-0.02
Sep
0.11
0.12
-0.01
Oct
0.93
1.11
-0.18
Nov
2.09
2.36
-0.27
Dec
3.95
4.43
-0.48
20.15
23.21
-3.06