Department of Water Resources Home

Flood Management

California State Climatologist

3310 El Camino Avenue
Suite 200
Sacramento, CA 95821

Mailing Address:
P.O. Box 219000
Sacramento, CA 95821-9000

San Francisco Bay Hydrologic Region


Region Avg Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Avg Temp 49.2 51.8 53.4 56.0 59.6 63.5 66.1 66.5 65.4 61.1 53.9 49.1 58.0
Std Dev T 1.9 2.1 2.3 2.2 2.2 1.7 1.3 1.1 1.9 1.7 2.2 2.3 0.9
Avg Precip 4.47 4.17 3.60 1.32 0.53 0.13 0.50 0.90 0.31 1.09 2.62 3.02 21.40
Std Dev P 3.23 3.27 2.63 1.07 0.74 0.17 0.11 0.21 0.40 0.91 2.17 2.00 8.05
Location: ANGWIN PAC UNION COL
Location: BERKELEY
Location: BLACK MOUNTAIN 2 WSW
Location: CALISTOGA
Location: FAIRFIELD
Location: HALF MOON BAY
Location: KENTFIELD
Location: LIVERMORE
Location: LOS GATOS
Location: MARTINEZ WATER PLANT
Location: MOUNT DIABLO JUNCTION
Location: MOUNT HAMILTON
Location: MUIR WOODS
Location: NAPA STATE HOSPITAL
Location: NEWARK (OAKLAND)
Location: OAKLAND MUSEUM
Location: PACIFICA 4 SSE
Location: PALO ALTO
Location: PETALUMA FIRE STA 2
Location: REDWOOD CITY
Location: RICHMOND
Location: SAINT HELENA
Location: SAN FRANCISCO DOWNTOWN
Location: SAN FRANCISCO INTL AP
Location: SAN FRANCISCO OCEANSIDE
Location: SAN GREGORIO 2 SE
Location: SAN JOSE
Location: SAN RAFAEL CIVIC CENTER
Location: SONOMA
Location: UPPER SAN LEANDRO FLTR
Location: WOODSIDE FIRE STN 1
Location: WRIGHTS