Climate averages 1991–2020
Santa Maria, United States weather
in December.
A mild, moderately wet month: the coolest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a mild month in Santa Maria, United States: daytime highs average 16.8°C and nights cool to about 7.1°C. By daytime temperature it is the coolest month of the year.
Expect about 71 mm of rain on roughly 6 days, which makes December a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 51 min on an average December day.
The nearest other city in this atlas is Santa Barbara (90 km away). In December its highs average 18.9°C, 2.0°C warmer than Santa Maria, United States, with 61 mm of rain.
Among the 498 cities listed in the United States, Santa Maria, United States ranks 116th of 498 for the warmest December highs and joint 255th of 498 for the driest December (rainfall, lowest first). The mean December high of those 498 cities is 10.5°C; Santa Maria, United States is 6.3°C warmer than that mean.
From December to January, average highs rise by 0.3°C to 17.1°C, and monthly rainfall rises from 71 mm to 96 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
Santa Maria, United States climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 17.1°C7.2°C | 7.2°C | 96 | 7.2 | 10.110 h |
| February | 17.1°C7.5°C | 7.5°C | 92 | 7.9 | 10.911 h |
| March | 18.4°C8.6°C | 8.6°C | 72 | 6.3 | 11.912 h |
| April | 20.0°C9.7°C | 9.7°C | 26 | 3.3 | 13.013 h |
| May | 21.9°C11.7°C | 11.7°C | 11 | 1.5 | 14.014 h |
| June | 24.3°C14.0°C | 14.0°C | 1.6 | 0.4 | 14.514 h |
| July | 25.8°C16.3°C | 16.3°C | 0.8 | 0.2 | 14.314 h |
| August | 26.6°C16.6°C | 16.6°C | 0.3 | 0.1 | 13.513 h |
| September | 26.2°C15.7°C | 15.7°C | 1.1 | 0.4 | 12.412 h |
| October | 24.2°C13.2°C | 13.2°C | 19 | 1.8 | 11.311 h |
| November | 20.2°C9.7°C | 9.7°C | 35 | 3.7 | 10.410 h |
| December, selected | 16.8°C7.1°C | 7.1°C | 71 | 6.1 | 9.910 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
- Santa Barbara in DecemberUnited States · 90 kmHigh 18.9°C · Low 9.1°C · 61 mm rain
- Ventura in DecemberUnited States · 129 kmHigh 17.1°C · Low 7.5°C · 58 mm rain
- Bakersfield in DecemberUnited States · 137 kmHigh 14.8°C · Low 3.8°C · 48 mm rain
- Oxnard in DecemberUnited States · 143 kmHigh 16.6°C · Low 9.1°C · 58 mm rain
- Simi Valley in DecemberUnited States · 169 kmHigh 17.4°C · Low 5.9°C · 58 mm rain
- Thousand Oaks in DecemberUnited States · 170 kmHigh 17.4°C · Low 6.5°C · 58 mm rain
- Valencia, United States in DecemberUnited States · 176 kmHigh 17.0°C · Low 4.8°C · 50 mm rain
- Santa Clarita in DecemberUnited States · 184 kmHigh 16.5°C · Low 4.7°C · 50 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 Santa Maria) is explained once on the Santa Maria, United States year overview and on the Sources, method and limits page.