Viewing Station: CA-AL-3 : Castro Valley 0.4 NNE
Jun 1, 2009 - Dec 22, 20255,720 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 1.80"
December 1-22, 2025(22 of 22 days covered by obs)
NOAA Normal
3.08"
Departure from Normal
-1.28" : 58% of Normal
Year-To-Date: 16.49"
Jan 1 to Dec 22, 2025(351 of 356 days covered by obs)
NOAA Normal
20.43"
Departure from Normal
-3.94" : 81% of Normal
Water Year-To-Date: 7.18"
Oct 1, 2025 to Dec 22, 2025(81 of 83 days covered by obs)
NOAA Normal
6.36"
Departure from Normal
0.82" : 113% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
4.16
4.16
0.00
Feb
4.00
4.14
-0.14
Mar
3.22
3.44
-0.22
Apr
1.63
1.84
-0.21
May
0.78
0.88
-0.10
Jun
0.14
0.24
-0.10
Jul
0.00
0.01
-0.01
Aug
0.03
0.05
-0.02
Sep
0.11
0.14
-0.03
Oct
1.01
1.15
-0.14
Nov
2.27
2.41
-0.14
Dec
4.34
4.47
-0.13
21.69
22.93
-1.24