Climate averages 1991–2020
Berkeley weather
in December.
A cool, moderately wet month: the coolest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in Berkeley: daytime highs average 13.6°C and nights cool to about 5.7°C. By daytime temperature it is the coolest month of the year.
Expect about 87 mm of rain on roughly 9 days, which makes December a moderately wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 36 min on an average December day.
The nearest other city in this atlas is Oakland (7 km away). In December its highs average 13.8°C, about as warm as Berkeley, with 87 mm of rain.
Among the 498 cities listed in the United States, Berkeley ranks joint 189th of 498 for the warmest December highs and joint 311th of 498 for the driest December (rainfall, lowest first). The mean December high of those 498 cities is 10.5°C; Berkeley is 3.1°C warmer than that mean.
From December to January, average highs rise by 0.1°C to 13.7°C, and monthly rainfall rises from 87 mm to 93 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Berkeley climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 13.7°C5.4°C | 5.4°C | 93 | 9.4 | 9.910 h |
| February | 15.1°C6.3°C | 6.3°C | 97 | 9.2 | 10.811 h |
| March | 16.8°C7.5°C | 7.5°C | 73 | 8.8 | 11.912 h |
| April | 18.9°C8.6°C | 8.6°C | 34 | 4.9 | 13.213 h |
| May | 21.8°C10.6°C | 10.6°C | 17 | 3.2 | 14.214 h |
| June | 24.9°C12.2°C | 12.2°C | 3.6 | 0.9 | 14.715 h |
| July | 25.9°C13.1°C | 13.1°C | 0.4 | 0.2 | 14.515 h |
| August | 26.2°C13.6°C | 13.6°C | 0.9 | 0.1 | 13.614 h |
| September | 26.2°C13.2°C | 13.2°C | 1.4 | 0.4 | 12.512 h |
| October | 23.2°C11.7°C | 11.7°C | 21 | 2.9 | 11.211 h |
| November | 17.4°C8.3°C | 8.3°C | 46 | 5.7 | 10.210 h |
| December, selected | 13.6°C5.7°C | 5.7°C | 87 | 9.3 | 9.610 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Oakland in DecemberUnited States · 7 kmHigh 13.8°C · Low 6.0°C · 87 mm rain
- San Francisco in DecemberUnited States · 17 kmHigh 13.5°C · Low 6.3°C · 108 mm rain
- Concord (California), United States in DecemberUnited States · 24 kmHigh 13.8°C · Low 6.0°C · 84 mm rain
- Daly City in DecemberUnited States · 25 kmHigh 12.6°C · Low 6.8°C · 108 mm rain
- Vallejo in DecemberUnited States · 26 kmHigh 13.9°C · Low 5.5°C · 95 mm rain
- San Ramon in DecemberUnited States · 28 kmHigh 13.6°C · Low 5.6°C · 81 mm rain
- Hayward in DecemberUnited States · 28 kmHigh 13.8°C · Low 6.2°C · 81 mm rain
- San Mateo in DecemberUnited States · 35 kmHigh 13.7°C · Low 7.2°C · 94 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Berkeley) is explained once on the Berkeley year overview and on the Sources, method and limits page.
Oakland lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.