Climate averages 1991–2020
Lancaster weather
in December.
A cool, fairly dry month: the coolest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in Lancaster: daytime highs average 13.3°C and nights cool to about 4.1°C. By daytime temperature it is the coolest month of the year.
Expect about 30 mm of rain on roughly 4 days, which makes December a fairly dry month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 53 min on an average December day.
The nearest other city in this atlas is Palmdale (13 km away). In December its highs average 13.4°C, about as warm as Lancaster, with 47 mm of rain.
Among the 498 cities listed in the United States, Lancaster ranks joint 203rd of 498 for the warmest December highs and joint 47th of 498 for the driest December (rainfall, lowest first). The mean December high of those 498 cities is 10.5°C; Lancaster is 2.8°C warmer than that mean.
From December to January, average highs rise by 0.6°C to 14.0°C, and monthly rainfall rises from 30 mm to 41 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
Lancaster climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 14.0°C4.5°C | 4.5°C | 41 | 4.6 | 10.110 h |
| February | 15.3°C5.0°C | 5.0°C | 47 | 5.0 | 10.911 h |
| March | 18.6°C6.7°C | 6.7°C | 31 | 4.0 | 11.912 h |
| April | 22.1°C8.7°C | 8.7°C | 11 | 1.9 | 13.013 h |
| May | 26.7°C12.3°C | 12.3°C | 3.6 | 1.0 | 14.014 h |
| June | 31.6°C16.0°C | 16.0°C | 1.3 | 0.3 | 14.414 h |
| July | 34.7°C19.4°C | 19.4°C | 3.8 | 1.0 | 14.214 h |
| August | 34.8°C19.5°C | 19.5°C | 1.4 | 0.5 | 13.513 h |
| September | 31.5°C17.4°C | 17.4°C | 3.0 | 0.6 | 12.412 h |
| October | 25.0°C12.9°C | 12.9°C | 8.3 | 1.1 | 11.311 h |
| November | 18.3°C7.8°C | 7.8°C | 9.7 | 1.9 | 10.410 h |
| December, selected | 13.3°C4.1°C | 4.1°C | 30 | 3.6 | 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
- Palmdale in DecemberUnited States · 13 kmHigh 13.4°C · Low 4.1°C · 47 mm rain
- Santa Clarita in DecemberUnited States · 50 kmHigh 16.5°C · Low 4.7°C · 50 mm rain
- Valencia, United States in DecemberUnited States · 52 kmHigh 17.0°C · Low 4.8°C · 50 mm rain
- Burbank in DecemberUnited States · 60 kmHigh 18.4°C · Low 6.3°C · 58 mm rain
- Pasadena (California), United States in DecemberUnited States · 61 kmHigh 17.6°C · Low 5.8°C · 58 mm rain
- Glendale (California), United States in DecemberUnited States · 63 kmHigh 18.1°C · Low 6.3°C · 58 mm rain
- El Monte in DecemberUnited States · 71 kmHigh 18.7°C · Low 6.7°C · 55 mm rain
- West Covina in DecemberUnited States · 72 kmHigh 18.4°C · Low 6.4°C · 55 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 Lancaster) is explained once on the Lancaster year overview and on the Sources, method and limits page.