Viewing Station: CA-AL-3 : Castro Valley 0.4 NNE
Jun 1, 2009 - Sep 17, 20255,626 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.20"
September 1-17, 2025(17 of 17 days covered by obs)
NOAA Normal
0.06"
Departure from Normal
0.14" : 321% of Normal
Year-To-Date: 9.25"
Jan 1 to Sep 17, 2025(257 of 260 days covered by obs)
NOAA Normal
14.02"
Departure from Normal
-4.77" : 66% of Normal
Water Year-To-Date: 17.47"
Oct 1, 2024 to Sep 17, 2025(347 of 352 days covered by obs)
NOAA Normal
21.64"
Departure from Normal
-4.17" : 81% 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