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California State Climatologist
Department of Water Resources

3310 El Camino Avenue, Suite 200
Sacramento, CA 95821

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


DWR My CA

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: ANGWIN PAC UNION COL

State: CA

Lat: 38 34'

Long: -122 26'

Elev: 1715

ID: 040212

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 39.3 39.9 40.6 42.9 46.8 51.3 55 54.3 53.4 49.6 42 38.3 46.1

Maximum 53.2 56 59.1 65.8 72.9 80.4 85.6 85 80.8 72.3 59.1 53 68.6

Mean 46.3 48 49.9 54.4 59.9 65.9 70.3 69.7 67.1 61 50.6 45.7 57.4

Precip. 8.47 7.75 6.21 2.27 1.14 0.26 0.05 0.1 0.62 2.17 5.48 6.15 40.67

HDD 582 478 470 326 203 73 13 16 55 173 438 599 3426

CDD 0 0 0 7 43 99 177 160 119 48 6 0 659

Location: BERKELEY

Location: BERKELEY

State: CA

Lat: 37 52'

Long: -122 16'

Elev: 310

ID: 040693

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 43.6 46.1 47.4 48.6 51.3 53.6 55.1 55.7 55.9 53.5 47.9 43.7 50.2

Maximum 56.4 59.3 60.9 64 66.6 69.5 70.4 70.6 71.7 70 62.3 56.6 64.9

Mean 50 52.7 54.2 56.3 59 61.6 62.8 63.2 63.8 61.8 55.1 50.2 57.6

Precip. 5.13 4.75 4.08 1.63 0.61 0.14 0.07 0.1 0.36 1.37 3.62 3.54 25.4

HDD 466 344 337 263 198 123 85 80 82 119 300 460 2857

CDD 0 0 0 1 11 18 22 23 46 18 3 0 142

Location: BLACK MOUNTAIN 2 WSW

Location: BLACK MOUNTAIN 2 WSW

State: CA

Lat: 37 19'

Long: -122 10'

Elev: 2120

ID: 040850

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Precip. 7.18 7.24 5.81 2.47 0.97 0.3 0.06 0.14 0.39 2.23 4.53 5.51 36.83

Location: CALISTOGA

Location: CALISTOGA

State: CA

Lat: 38 35'

Long: -122 34'

Elev: 370

ID: 041312

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 35.4 38.2 40 41.6 46.3 50.4 52.7 52.5 50.7 45.9 39.4 35.2 44

Maximum 59 62.9 66.5 71.5 78.7 86.5 91.7 91 87.3 79.5 66 59.2 75

Mean 47.2 50.6 53.3 56.6 62.5 68.5 72.2 71.8 69 62.7 52.7 47.2 59.5

Precip. 7.74 7.85 5.98 2.22 0.95 0.22 0.1 0.11 0.46 1.96 5.13 5.79 38.51

HDD 551 406 369 270 129 26 2 1 18 116 372 551 2811

CDD 0 0 4 15 51 130 224 210 138 45 2 0 819

Location: FAIRFIELD

Location: FAIRFIELD

State: CA

Lat: 38 16'

Long: -122 04'

Elev: 40

ID: 042934

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 37.5 40.9 43.9 46.3 50.6 54.1 56.4 56.5 54.5 49.9 42.9 36.9 47.5

Maximum 54.7 61.2 65.6 71.4 78.1 84.7 88.8 88.7 86.3 78.3 64.8 55.6 73.2

Mean 46.1 51.1 54.8 58.9 64.4 69.4 72.6 72.6 70.4 64.1 53.9 46.3 60.4

Precip. 5.04 4.57 3.59 1.12 0.64 0.16 0.03 0.05 0.3 1.24 3.08 3.64 23.46

HDD 586 390 321 201 99 18 1 2 14 95 340 582 2649

CDD 0 0 4 16 78 151 237 239 176 68 6 0 975

Location: HALF MOON BAY

Location: HALF MOON BAY

State: CA

Lat: 37 28'

Long: -122 27'

Elev: 16

ID: 043714

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 43.4 44.3 44.6 44.8 47.5 49.9 52 53.2 52 48.8 45.7 43.4 47.5

Maximum 58 58.8 59.1 60.7 61.3 63.4 64.6 65.6 66.5 65 61.6 58.2 61.9

Mean 50.7 51.6 51.9 52.8 54.4 56.7 58.3 59.4 59.3 56.9 53.7 50.8 54.7

Precip. 5.55 4.91 4.36 1.77 0.79 0.26 0.16 0.27 0.44 1.82 3.53 4.1 27.96

HDD 443 376 374 368 328 250 210 177 176 254 341 440 3737

CDD 0 0 0 0 0 0 2 3 4 2 0 0 11

Location: KENTFIELD

Location: KENTFIELD

State: CA

Lat: 37 57'

Long: -122 34'

Elev: 128

ID: 044500

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 40.7 43 44.1 45.8 48.9 52 53.4 53.6 52.5 49.6 45 40.6 47.4

Maximum 56.2 61.4 65.3 70.6 76 81.8 85 84.4 82.1 75.4 63.4 56.3 71.5

Mean 48.5 52.2 54.7 58.2 62.5 66.9 69.2 69 67.3 62.5 54.2 48.5 59.5

Precip. 9.6 9.1 7.05 2.56 1.2 0.24 0.01 0.12 0.5 2.33 7.47 7.29 47.47

HDD 513 358 323 215 121 41 9 7 28 112 327 513 2567

CDD 0 0 3 10 41 98 140 130 98 35 2 0 557

Location: LIVERMORE

Location: LIVERMORE

State: CA

Lat: 37 42'

Long: -121 47'

Elev: 480

ID: 044997

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 37.4 40.3 42.3 44.2 48.5 52.5 54.9 55 53.2 48.4 41.5 36.9 46.3

Maximum 56.9 61.8 65.3 71.2 77 84 89.1 88.7 85.9 77.9 64.8 57 73.3

Mean 47.2 51.1 53.8 57.7 62.8 68.3 72 71.9 69.6 63.2 53.2 47 59.8

Precip. 2.99 2.77 2.47 0.96 0.43 0.09 0.03 0.08 0.24 0.84 1.88 2.04 14.82

HDD 555 391 349 238 130 34 6 4 19 111 358 560 2755

CDD 0 0 2 18 60 131 222 216 154 53 2 0 858

Location: LOS GATOS

Location: LOS GATOS

State: CA

Lat: 37 14'

Long: -121 58'

Elev: 365

ID: 045123

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 38.8 41.1 42.9 44.4 48.2 52 55.1 54.8 53.3 48.6 42.4 38.1 46.6

Maximum 58.5 62.4 65.5 70.7 75.9 81.8 85.4 84.9 82.5 75.6 64.7 58.2 72.2

Mean 48.7 51.8 54.2 57.6 62.1 66.9 70.3 69.9 67.9 62.1 53.6 48.2 59.4

Precip. 5.11 4.77 3.93 1.19 0.46 0.1 0.04 0.08 0.24 1.02 2.47 3.23 22.64

HDD 506 370 337 231 134 36 8 1 29 122 345 522 2641

CDD 0 0 1 8 42 93 170 150 117 32 0 0 613

Location: MARTINEZ WATER PLANT

Location: MARTINEZ WATER PLANT

State: CA

Lat: 38 01'

Long: -122 07'

Elev: 40

ID: 045378

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 38.8 41.8 44.3 46.1 49.7 53.8 54.9 55 53.8 49.5 43.3 38.5 47.5

Maximum 53.7 59.5 64.3 70.9 77.7 83.9 87.4 86.6 83.3 75.5 62.7 54.5 71.7

Mean 46.3 50.7 54.3 58.5 63.7 68.9 71.2 70.8 68.6 62.5 53 46.5 59.6

Precip. 4.25 3.81 3.24 1.04 0.46 0.12 0.02 0.08 0.24 0.94 2.59 2.79 19.58

HDD 582 402 335 212 106 28 4 5 33 115 362 573 2757

CDD 0 0 2 17 66 143 195 185 139 37 2 0 786

Location: MOUNT DIABLO JUNCTION

Location: MOUNT DIABLO JUNCTION

State: CA

Lat: 37 53'

Long: -121 56'

Elev: 2170

ID: 045915

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 39.3 40.7 40.7 43.3 47.4 53.2 59.6 59.5 57.5 51.8 43.7 39.7 48

Maximum 55.6 57.2 59.2 64.8 70.8 78.7 85.2 85.1 82.2 74.4 61.9 56.2 69.3

Mean 47.5 49 50 54.1 59.1 66 72.4 72.3 69.9 63.1 52.8 48 58.7

Precip. 4.76 4.49 3.83 1.46 0.85 0.15 0.05 0.08 0.36 1.31 3.27 3.35 23.96

HDD 545 451 429 337 237 105 29 12 44 147 379 530 3245

CDD 0 0 1 8 53 132 259 239 188 89 13 1 983

Location: MOUNT HAMILTON

Location: MOUNT HAMILTON

State: CA

Lat: 37 21'

Long: -121 39'

Elev: 4206

ID: 045933

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 37.5 36.9 37 40 46.8 55.3 63.1 62.8 58.2 50.8 41 37.3 47.2

Maximum 49.4 49.6 50.4 55.8 63.4 72 78.2 77.9 73.8 65.3 53.9 49.9 61.6

Mean 43.5 43.3 43.7 47.9 55.1 63.7 70.7 70.4 66 58.1 47.5 43.6 54.5

Precip. 4.42 4.02 3.9 1.77 0.95 0.24 0.05 0.09 0.44 1.51 3.23 3.11 23.73

HDD 669 608 600 520 346 130 37 30 112 272 533 664 4521

CDD 0 0 0 7 39 89 212 196 142 56 6 0 747

Location: MUIR WOODS

Location: MUIR WOODS

State: CA

Lat: 37 53'

Long: -122 34'

Elev: 220

ID: 046027

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Precip. 7.32 6.85 5.63 2.18 1.11 0.3 0.12 0.17 0.46 2.07 5.78 5.6 37.59

Location: NAPA STATE HOSPITAL

Location: NAPA STATE HOSPITAL

State: CA

Lat: 38 17'

Long: -122 16'

Elev: 35

ID: 046074

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 39.2 41.8 43.1 44.7 48.8 52.6 54.5 54.5 53.1 49 42.9 38.6 46.9

Maximum 56.6 61.8 65.4 70.5 75.4 80.5 82.6 82.4 81.8 76.4 64.1 56.8 71.2

Mean 47.9 51.8 54.3 57.6 62.1 66.6 68.6 68.5 67.5 62.7 53.5 47.7 59.1

Precip. 5.35 5.03 4.09 1.45 0.78 0.16 0.05 0.11 0.41 1.43 3.72 3.88 26.46

HDD 529 370 335 231 133 49 9 13 31 105 347 537 2689

CDD 0 0 2 9 42 94 120 120 105 34 3 0 529

Location: NEWARK (OAKLAND)

Location: NEWARK (OAKLAND)

State: CA

Lat: 37 31'

Long: -122 02'

Elev: 10

ID: 046144

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 42 45.1 47.3 49.8 52.9 55.9 57.7 58.4 57.5 53.8 47.1 41.7 50.8

Maximum 57.6 61.4 64.3 68.1 71.5 75.9 78.3 78.6 78 73.5 64.4 57.7 69.1

Mean 49.8 53.3 55.8 59 62.2 65.9 68 68.5 67.8 63.7 55.8 49.7 60

Precip. 2.97 2.89 2.39 0.94 0.42 0.12 0.03 0.07 0.2 0.9 1.84 2.08 14.85

HDD 471 331 290 197 129 52 19 7 35 82 280 474 2367

CDD 0 1 6 15 42 79 112 115 118 40 2 0 530

Location: OAKLAND MUSEUM

Location: OAKLAND MUSEUM

State: CA

Lat: 37 48'

Long: -122 16'

Elev: 30

ID: 046336

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 44.7 47.6 49 50.6 53.3 55.7 57 58.3 58.2 55.2 49.4 44.8 52

Maximum 57.1 61.2 63.2 66.4 68.9 71.6 72.7 73.5 74.6 72.1 63.9 57.6 66.9

Mean 50.9 54.4 56.1 58.5 61.1 63.7 64.9 65.9 66.4 63.7 56.7 51.2 59.5

Precip. 4.85 4.27 3.56 1.38 0.57 0.11 0.07 0.1 0.33 1.33 3.14 3.23 22.94

HDD 438 298 282 202 143 89 60 45 69 89 257 428 2400

CDD 0 1 6 8 23 49 55 72 110 47 6 0 377

Location: PACIFICA 4 SSE

Location: PACIFICA 4 SSE

State: CA

Lat: 37 36'

Long: -122 28'

Elev: 475

ID: 046599

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 44.8 45.9 45.7 46.1 48.1 50 51.9 52.3 53 52 48.4 45.2 48.6

Maximum 55.5 58.3 59.7 62.8 65.2 68.8 70.4 70.1 70.9 67.7 59.9 55.7 63.8

Mean 50.2 52.1 52.7 54.5 56.7 59.4 61.2 61.2 62 59.9 54.2 50.5 56.2

Precip. 6.34 5.57 4.42 1.93 0.85 0.22 0.03 0.12 0.41 1.43 3.84 4.34 29.5

HDD 461 361 351 319 262 177 128 128 114 168 327 451 3247

CDD 0 0 0 4 6 8 8 12 23 9 2 0 72

Location: PALO ALTO

Location: PALO ALTO

State: CA

Lat: 37 27'

Long: -122 08'

Elev: 25

ID: 046646

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 40.4 43.2 45.6 47.4 51.2 55 57.1 57.2 55 50 43.9 39.2 48.8

Maximum 57.6 61.6 64.3 69 73.5 77.4 78.8 78.7 77.8 73 64.1 58.2 69.5

Mean 49 52.4 55 58.2 62.4 66.2 68 68 66.4 61.5 54 48.7 59.2

Precip. 3.24 3.18 2.65 0.89 0.35 0.11 0.03 0.08 0.19 0.85 1.83 2.31 15.71

HDD 496 353 312 211 124 46 15 10 53 128 330 506 2584

CDD 0 0 1 8 41 81 106 101 95 19 0 0 452

Location: PETALUMA FIRE STA 2

Location: PETALUMA FIRE STA 2

State: CA

Lat: 38 16'

Long: -122 39'

Elev: 31

ID: 046826

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 38.9 41.2 42.5 44.2 46.9 50.2 51.8 52.1 51.5 47.5 42.2 37.7 45.6

Maximum 57.9 62.6 65.3 69.8 73.9 79.3 82.7 82.8 82.2 77.1 65.9 58.1 71.5

Mean 48.4 51.9 53.9 57 60.4 64.8 67.3 67.5 66.9 62.3 54.1 47.9 58.5

Precip. 5.41 5.31 3.85 1.4 0.62 0.15 0.05 0.08 0.29 1.37 3.52 3.8 25.85

HDD 515 366 345 247 167 65 22 13 32 110 329 530 2741

CDD 0 0 0 8 23 56 93 88 88 27 2 0 385

Location: REDWOOD CITY

Location: REDWOOD CITY

State: CA

Lat: 37 29'

Long: -122 14'

Elev: 31

ID: 047339

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 39.1 41.7 43.6 45.2 48.9 52.7 55.2 55 53.2 48.7 42.9 38.6 47.1

Maximum 57.7 61.7 65.1 69.9 74 78.7 80.8 80.5 78.5 73 63.2 57.4 70

Mean 48.4 51.7 54.4 57.6 61.5 65.7 68 67.8 65.9 60.9 53.1 48 58.6

Precip. 4.2 4.04 3.37 1.07 0.43 0.1 0.03 0.1 0.21 1.06 2.62 2.93 20.16

HDD 515 371 332 232 145 51 17 12 54 149 358 528 2764

CDD 0 0 1 8 34 72 109 98 79 21 0 0 422

Location: RICHMOND

Location: RICHMOND

State: CA

Lat: 37 37'

Long: -122 22'

Elev: 20

ID: 047414

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 42.9 45.4 46.8 48.4 50.9 53.6 54.9 55.9 56.1 53.1 47.6 43 49.9

Maximum 57.1 60.9 63.2 66.3 68.3 70.7 70.5 71 73.4 71.8 63.6 57.3 66.2

Mean 50 53.2 55 57.4 59.6 62.2 62.7 63.5 64.8 62.5 55.6 50.2 58.1

Precip. 4.91 4.41 3.52 1.35 0.54 0.17 0.07 0.09 0.27 1.25 3.47 3.3 23.35

HDD 464 332 311 234 181 111 93 71 71 107 285 460 2720

CDD 0 0 1 5 13 26 23 23 63 27 3 0 184

Location: SAINT HELENA

Location: SAINT HELENA

State: CA

Lat: 38 30'

Long: -122 28'

Elev: 225

ID: 047643

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 37.8 40.3 41.8 44.2 48 52.1 53.9 53.6 51.6 47.2 41.6 36.7 45.7

Maximum 58 62.5 66.3 73 79.2 85.5 89.3 88.3 85.6 77.7 65.1 58.4 74.1

Mean 47.9 51.4 54.1 58.6 63.6 68.8 71.6 71 68.6 62.5 53.4 47.6 59.9

Precip. 7.46 7.1 5.31 1.74 0.68 0.17 0.04 0.08 0.41 1.84 4.83 5.22 34.88

HDD 531 381 343 216 115 21 5 5 26 116 352 541 2652

CDD 0 0 3 23 72 134 210 190 134 37 3 0 806

Location: SAN FRANCISCO DOWNTOWN

Location: SAN FRANCISCO DOWNTOWN

State: CA

Lat: 37 46'

Long: -122 26'

Elev: 175

ID: 047772

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 46.4 48.5 49.2 50.1 51.4 53.2 54.4 55.6 56.1 54.6 50.8 46.7 51.4

Maximum 58.1 61.4 62.5 64.5 65.4 67.7 68.2 69.2 71.3 70.4 64.1 58.6 65.1

Mean 52.3 55 55.9 57.3 58.4 60.5 61.3 62.4 63.7 62.5 57.5 52.7 58.3

Precip. 4.72 4.15 3.4 1.25 0.54 0.13 0.04 0.09 0.28 1.19 3.31 3.18 22.28

HDD 396 283 263 233 214 150 133 107 95 100 232 383 2589

CDD 0 2 4 7 9 14 19 26 56 22 5 0 164

Location: SAN FRANCISCO INTL AP

Location: SAN FRANCISCO INTL AP

State: CA

Lat: 37 37'

Long: -122 24'

Elev: 8

ID: 047769

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 42.9 45.5 46.8 48.1 50.5 52.9 54.5 55.5 55.1 52.4 47.5 43 49.6

Maximum 55.9 59.3 61.2 64.3 66.8 69.9 71.1 71.7 72.7 69.7 62 56.1 65.1

Mean 49.4 52.4 54 56.2 58.7 61.4 62.8 63.6 63.9 61 54.7 49.5 57.3

Precip. 4.45 4.01 3.26 1.18 0.38 0.11 0.03 0.07 0.2 1.04 2.49 2.89 20.11

HDD 482 354 339 266 201 120 77 56 62 131 298 476 2862

CDD 0 0 0 4 10 21 23 26 38 20 0 0 142

Location: SAN FRANCISCO OCEANSIDE

Location: SAN FRANCISCO OCEANSIDE

State: CA

Lat: 37 44'

Long: -122 30'

Elev: 8

ID: 047767

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 44.6 46.4 47.4 48 49.7 51.5 53.5 54.8 54.6 53.3 48.7 45.2 49.8

Maximum 56.5 58.7 58.9 59 58.8 60.1 61.1 62.5 64.3 64.5 60.7 56.7 60.2

Mean 50.6 52.6 53.2 53.5 54.3 55.8 57.3 58.7 59.5 58.9 54.7 51 55

Precip. 4.14 3.74 3.23 1.17 0.51 0.09 0.03 0.08 0.17 1.03 2.61 2.97 19.77

HDD 448 349 346 345 333 277 240 202 174 193 309 437 3653

CDD 0 0 0 0 0 0 1 4 8 4 0 0 17

Location: SAN GREGORIO 2 SE

Location: SAN GREGORIO 2 SE

State: CA

Lat: 37 18'

Long: -122 22'

Elev: 275

ID: 047807

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Minimum 40.3 41.6 42.2 42.6 46 48.2 50.6 51.1 49.3 45.4 41.7 39.1 44.8

Maximum 60.1 60.3 60.2 62.1 63.8 67.1 69.9 71.1 72.5 70.2 64.8 60.7 65.2

Mean 50.2 51 51.2 52.4 54.9 57.7 60.3 61.1 60.9 57.8 53.3 49.9 55.1

Precip. 5.71 5.37 4.6 2 0.85 0.29 0.13 0.2 0.41 1.67 3.93 4.36 29.52

HDD 459 394 392 379 314<