Fairfax County (Herndon)
December
Weather in Fairfax County, Virginia for December 2026
Your guide to Fairfax County weather in December - trends and predictions
With an average of 3 snowy days, Fairfax County usually enjoys a light touch of snow in December.
In general, the average temperature in Fairfax County at the beginning of December is 4.1 °C. As the month progressed, temperatures tended to remain steady, reaching an average of 4.1 °C by the end of December.
With an average of 4 rainy days, Fairfax County experiences minimal rainfall in December.
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Snow Forecast ❄️
Temperatures
Rain 🌧️
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24
Dry days
4
Rainy days
3
Snow days
4°/-2°
Temperatures
19 km/h
Avg max wind
70 %
Avg humidity
Fairfax County Weather December
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Temperatures trend during December in Fairfax County
See the weather trend as well as the moving average line
December weather in Fairfax County day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 |  Partly cloudy | 4° /-1° | 0 mm | 0 cm | |
| Dec. 2 |  Moderate or heavy rain shower | 3° /1° | 72.3 mm | 0 cm | |
| Dec. 3 |  Sunny | 6° /-2° | 0 mm | 0 cm | |
| Dec. 4 |  Cloudy | 5° /-1° | 0 mm | 0 cm | |
| Dec. 5 |  Moderate or heavy snow showers | 0° /-6° | 10.6 mm | 7.7 cm | |
| Dec. 6 |  Overcast | 6° /0° | 0 mm | 0 cm | |
| Dec. 7 | Overcast | 5° /1° | 0 mm | 0 cm | |
| Dec. 8 | Cloudy | 0° /-3° | 0 mm | 0 cm | |
| Dec. 9 | Cloudy | 0° /-7° | 0 mm | 0 cm | |
| Dec. 10 | Overcast | 5° /-1° | 0 mm | 0 cm | |
| Dec. 11 | Partly cloudy | 2° /-2° | 0 mm | 0 cm | |
| Dec. 12 | Overcast | 1° /-2° | 0 mm | 0 cm | |
| Dec. 13 |  Mist | 5° /-1° | 0 mm | 0 cm | |
| Dec. 14 |  Heavy snow | 1° /-5° | 14.9 mm | 10 cm | |
| Dec. 15 | Partly cloudy | 0° /-7° | 0 mm | 0 cm | |
| Dec. 16 | Cloudy | 5° /-3° | 0 mm | 0 cm | |
| Dec. 17 | Overcast | 5° /-1° | 0 mm | 0 cm | |
| Dec. 18 |  Freezing fog | 8° /-1° | 1.6 mm | 0 cm | |
| Dec. 19 |  Heavy rain | 12° /-1° | 37.5 mm | 0 cm | |
| Dec. 20 | Overcast | 3° /-4° | 0 mm | 0 cm | |
| Dec. 21 | Overcast | 8° /0° | 0 mm | 0 cm | |
| Dec. 22 | Sunny | 4° /-4° | 0 mm | 0 cm | |
| Dec. 23 |  Light rain | 8° /1° | 11.3 mm | 0 cm | |
| Dec. 24 | Overcast | 7° /3° | 0 mm | 0 cm | |
| Dec. 25 | Moderate or heavy snow showers | 5° /0° | 20.7 mm | 2.5 cm | |
| Dec. 26 | Overcast | 1° /-2° | 0 mm | 0 cm | |
| Dec. 27 | Overcast | 3° /0° | 0 mm | 0 cm | |
| Dec. 28 | Mist | 2° /-2° | 0 mm | 0 cm | |
| Dec. 29 | Overcast | 13° /0° | 0 mm | 0 cm | |
| Dec. 30 | Sunny | 2° /-3° | 0 mm | 0 cm | |
| Dec. 31 | Overcast | 3° /-4° | 0 mm | 0 cm | |
| Next | |||||
Important Notice
Our weather forecast for Fairfax County in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Fairfax County forecast closer to your planned date for the most up-to-date weather information.
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Fairfax County in December - FAQ
What are the expected maximum and minimum temperatures in Fairfax County during December?
Brace for cold days with temperatures not exceeding 4° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in Fairfax County during December?
Significant rainfall exceeding 168.9 mm is expected in Fairfax County during December, occurring over more than 4 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Fairfax County in December 2026?
Fairfax County experiences an average snowfall of 20.2 cm during December, occurring over 3 days.
What are the typical wind conditions in Fairfax County during December?
The average wind speed in Fairfax County during December is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
Fairfax County snow forecast December 2026
Track daily snowfall levels and discover Fairfax County’s snowy potential this December ❄️
On average, Fairfax County sees 3 snowy days during December, with approximately 20.2 cm of total snowfall.
December rainfall patterns in Fairfax County
Explore the daily rainfall trends and prepare for Fairfax Countys December weather 💧
Typically, Fairfax County has 4 rainy days in December with a total of 168.9 mm of rainfall.
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Where is Fairfax County?Get accurate weather forecasts for Fairfax County, located at latitude 38.97 and longitude -77.386. Stay updated with localized weather information tailored for Fairfax County.
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