Rockville Weather in December

Rockville in December sees low daytime temperatures of 9°C (48°F) and nighttime lows of -1°C (30°F). Rainfall is fairly high this month at around 103 mm (4.1 in), so pack a rain jacket to stay dry.

Rainfall in Rockville in December

Historically, approximately 11 days this month are expected to have snow/rain, averaging 103 mm (4.1 in). When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Rockville in December

In December, Rockville sees low temperatures, with highs of 9°C (48°F). Nights drop to around -1°C (30°F). During December, the winter season is in full swing. Temperatures remain on the cold side all day. A proper warm jacket is worth having, not just for evenings. 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 Rockville in December

The area experiences a moderate amount of sunshine, with approximately 130 hours of sunlight expected. This means a decent mix of sun and overcast.

If you prefer dry days with pleasant temperatures, December may not be the ideal month to visit Rockville. Our weather planner can help you explore destinations with more pleasant weather conditions.

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

Rockville Temperature in December

Min Temperature -1°C (30°F)  

Max Temperature 9°C (48°F)  

Chance of Rain 37%  

Precipitation 103 mm (4.1 in)  

Rainy days 11 days  

Humidity 64% *  

Sunshine 130 hours *  

Percentage Sunshine 45% *  

* Data from: Washington DC, the United States of America (27 KM, 17 Miles).

What to Wear in Rockville in December

Dress warmly and in layers for your trip to Rockville in December. A good base layer system works wonders. Start with good thermal underwear, add something warm like a fleece sweater, then finish with a waterproof jacket on top. Expect heavy rainfall, so bring good rain protection and waterproof bags. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in Rockville 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 Rockville's climate page.

More climate data for Rockville

Temperature Rainfall Sunshine Humidity

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