Washington DC Weather in December
United States · Humid Subtropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
December in Washington DC sees average temperatures ranging from a low of 0.7°C (33.3°F) to a high of 9.2°C (48.6°F), with a mean of 4.6°C (40.3°F). Compared to the annual average of 14.2°C (57.6°F), this month is 9.6°C cooler than the yearly norm. Precipitation averages 116.2mm, making it approximately 2.0mm drier than the monthly average of 119.0mm. The city receives an average of 6.2 hours of sunshine per day during December, with relative humidity averaging 71.2%. Wind speeds reach an average maximum of 17.1 km/h. Snowfall averages 1.8cm during December, which can affect travel plans and outdoor activities. For travelers, this month offers a temperature experience in Washington DC, with drier-than-average conditions compared to the rest of the year.
There's something about Washington DC in late March when the cherry blossoms peak that turns the political city into something tender. I stood at the Tidal Basin one spring as 3,000 trees bloomed pink against the Jefferson Memorial — the data says peak bloom is usually the last week of March to first week of April, around 15°C. Summer (June-August) is famously brutal: 30°C with 70% humidity, the kind that makes the National Mall feel like a sauna. October is DC's secret weapon: 18°C, golden leaves along the Mall, and the cultural season reopening. Winter is quieter and the museums are empty — a trade-off worth making.
December vs Adjacent Months
| Metric | November | December | January |
|---|---|---|---|
| Mean Temp | 9.2°C (48.6°F) | 4.6°C (40.3°F) | 2.9°C (37.2°F) |
| Rainfall | 90.9mm | 116.2mm | 86.9mm |
| Sunshine | 7.9 hrs | 6.2 hrs | 5.9 hrs |
| Humidity | 68.7% | 71.2% | 70.1% |
| Wind | 17.3 km/h | 17.1 km/h | 18.8 km/h |
| Rainy Days | 9.0 | 12.2 | 11.4 |
| Snowfall | 0.2 cm | 1.8 cm | 10.9 cm |
Seasonal Context
December falls in Winter in the Northern Hemisphere. Winter is the coolest season with the shortest daylight hours. For travelers visiting Washington DC in December, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Washington DC in December?
The average temperature in Washington DC during December ranges from 0.7°C (33.3°F) to 9.2°C (48.6°F), with a mean of 4.6°C (40.3°F).
How much does it rain in Washington DC in December?
Washington DC receives an average of 116.2mm of precipitation in December, spread across approximately 12.2 rainy days.
What should I pack for Washington DC in December?
Based on December weather data, pack heavy winter clothing, thermal layers, and a warm coat. Rain gear is essential — this month averages 116.2mm of precipitation.
Is December a good time to visit Washington DC?
December is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Washington DC
Cities with Similar December Climate (Humid Subtropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 38.9°, -77.04°. Timezone: America/New_York. Last updated: 2026-07-30.