McLean Weather in December

December in McLean averages 9°C (48°F) during the day and 0°C (32°F) at night. Quite a bit of snow/rainfall is typical this month, with around 100 mm (3.9 in) on average. An umbrella is a good idea.

Rainfall in McLean in December

This month experiences about 11 days of snow/rain according to historical data, averaging 100 mm (3.9 in). The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in McLean in December

Temperatures in McLean in December top out at 9°C (48°F) and drop to 0°C (32°F) overnight. Experience the winter season in December. Even at the warmest part of the day, temperatures stay low. Dressing warmly from the start is the sensible approach. With overnight lows of 0°C (32°F), temperatures fall below freezing at night. An extra thick blanket can make a real difference if your accommodation runs cold.

Sunshine in McLean 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.

Wind Speed in McLean in December

Wind speeds average 4 m/s (8 knots) during December. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.

December in McLean has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.

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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 McLean's climate page.

McLean Temperature in December

Min Temperature 0°C (32°F)  

Max Temperature 9°C (48°F)  

Chance of Rain 37%  

Precipitation 100 mm (3.9 in)  

Rainy days 11 days  

Humidity 64% *  

Windspeed 4 m/s (8 knots) *  

Sunshine 130 hours *  

Percentage Sunshine 45% *  

* Data from: Washington DC, the United States of America (15 KM, 9 Miles).

What to Wear in McLean in December

We recommend to layer up for chilly conditions in McLean 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. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in McLean 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 McLean's climate page.

More climate data for McLean

Temperature Rainfall Sunshine Humidity Wind Speed

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