Herndon Weather in December

During December, Herndon experiences low daytime temperatures of 9°C (48°F) and cooler nights around -1°C (30°F). As part of the winter season, expect quite a bit of snow/rainfall. Around 96 mm (3.8 in) is typical.

Rainfall in Herndon in December

Historically, December sees about 12 days of snow/rain, with a monthly average of 96 mm (3.8 in). When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Herndon in December

Herndon in December gets highs of 9°C (48°F) during the day and drops to -1°C (30°F) at night. During December, you'll experience the winter season. It stays cool throughout the day, so warm layers are a good idea from morning to evening. With overnight lows of -1°C (30°F), temperatures fall below freezing at night. An extra thick blanket can make a real difference if your accommodation runs cold.

Sunshine in Herndon in December

The month brings about 130 hours of sunlight, offering a comfortable mix of sun and overcast.

If you're looking for dry conditions and comfortable temperatures, December may not be the ideal month to visit Herndon. Our weather planner can help you explore destinations with more pleasant weather conditions.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Herndon's climate page.

Herndon Temperature in December

Min Temperature -1°C (30°F)  

Max Temperature 9°C (48°F)  

Chance of Rain 39%  

Precipitation 96 mm (3.8 in)  

Rainy days 12 days  

Humidity 64% *  

Sunshine 130 hours *  

Percentage Sunshine 45% *  

* Data from: Washington DC, the United States of America (33 KM, 20 Miles).

What to Wear in Herndon in December

We recommend to layer up for chilly conditions in Herndon in December. You could start with thermal underwear or a good base layer to keep your core warm on the cooler days this month. Maybe also add a sweater or fleece, and top it off with a windproof jacket. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Herndon in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

4/10

Walking

4/10

Camping

1/10

Outdoor sports

4/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Herndon's climate page.

More climate data for Herndon

Temperature Rainfall Sunshine Humidity

See the full Herndon climate overview or explore weather in the United States of America.