Climate averages 1991–2020
Baltimore weather
in December.
A cold, wet month: the 10th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Baltimore: daytime highs average 7.1°C and nights cool to about -0.4°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 109 mm of rain on roughly 10 days, which makes December a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 28 min on an average December day.
The nearest other city in this atlas is Columbia (Maryland), United States (20 km away). In December its highs average 6.9°C, about as warm as Baltimore, with 94 mm of rain.
Among the 498 cities listed in the United States, Baltimore ranks joint 299th of 498 for the warmest December highs and joint 425th of 498 for the driest December (rainfall, lowest first). The mean December high of those 498 cities is 10.5°C; Baltimore is 3.4°C cooler than that mean.
From December to January, average highs fall by 2.4°C to 4.8°C, and monthly rainfall falls from 109 mm to 90 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
Baltimore climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.8°C-2.9°C | -2.9°C | 90 | 9.0 | 9.710 h |
| February | 6.4°C-2.5°C | -2.5°C | 84 | 9.2 | 10.711 h |
| March | 10.9°C1.3°C | 1.3°C | 114 | 10.5 | 11.912 h |
| April | 17.2°C7.0°C | 7.0°C | 97 | 10.4 | 13.213 h |
| May | 22.2°C12.7°C | 12.7°C | 96 | 11.0 | 14.314 h |
| June | 27.0°C18.0°C | 18.0°C | 90 | 10.9 | 14.915 h |
| July | 29.6°C21.0°C | 21.0°C | 97 | 11.4 | 14.615 h |
| August | 28.6°C20.2°C | 20.2°C | 93 | 10.4 | 13.714 h |
| September | 24.8°C16.6°C | 16.6°C | 120 | 9.4 | 12.512 h |
| October | 18.6°C10.2°C | 10.2°C | 102 | 8.4 | 11.211 h |
| November | 12.3°C4.2°C | 4.2°C | 86 | 8.3 | 10.110 h |
| December, selected | 7.1°C-0.4°C | -0.4°C | 109 | 9.6 | 9.59 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
- Columbia (Maryland), United States in DecemberUnited States · 20 kmHigh 6.9°C · Low -0.1°C · 94 mm rain
- Silver Spring in DecemberUnited States · 49 kmHigh 7.4°C · Low -0.2°C · 90 mm rain
- Washington in DecemberUnited States · 57 kmHigh 8.2°C · Low 0.1°C · 90 mm rain
- Germantown in DecemberUnited States · 58 kmHigh 6.8°C · Low -0.6°C · 89 mm rain
- Arlington (Virginia), United States in DecemberUnited States · 62 kmHigh 7.6°C · Low -0.2°C · 90 mm rain
- Alexandria, United States in DecemberUnited States · 66 kmHigh 8.2°C · Low 0.5°C · 87 mm rain
- Centreville in DecemberUnited States · 86 kmHigh 7.5°C · Low 0.3°C · 87 mm rain
- Wilmington (Delaware), United States in DecemberUnited States · 105 kmHigh 6.9°C · Low -0.3°C · 100 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 Baltimore) is explained once on the Baltimore year overview and on the Sources, method and limits page.