Viewing Station: CA-AL-43 : Castro Valley 1.7 WNW
Oct 2, 2018 - Sep 17, 2025346 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.14"
September 1-17, 2025(17 of 17 days covered by obs)
NOAA Normal
0.06"
Departure from Normal
0.08" : 225% of Normal
Year-To-Date: 8.67"
Jan 1 to Sep 17, 2025(235 of 260 days covered by obs)
NOAA Normal
13.13"
Departure from Normal
-4.46" : 66% of Normal
Water Year-To-Date: 13.81"
Oct 1, 2024 to Sep 17, 2025(263 of 352 days covered by obs)
NOAA Normal
20.10"
Departure from Normal
-6.29" : 69% 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