December weather forecast
Wheaton, MD

Share

Weather in December

The first month of the winter, December, is also a frosty month in Wheaton, Maryland, with an average temperature ranging between min 32.9°F (0.5°C) and max 45.3°F (7.4°C).

Temperature

December's arrival aligns with a minor decrease in average high-temperatures, from November's fresh 53.4°F (11.9°C) to a frosty 45.3°F (7.4°C). Nighttime temperatures consistently average a wintry 32.9°F (0.5°C) during December.

Humidity

The months with the highest humidity are May, October and December, with an average relative humidity of 76%.

Rainfall

In December, the rain falls for 10.2 days. Throughout December, 2.76" (70mm) of precipitation is accumulated. In Wheaton, during the entire year, the rain falls for 160.9 days and collects up to 32.99" (838mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In Wheaton, Maryland, during December, snow falls for 2.9 days and regularly aggregates up to 1.38" (35mm) of snow. In Wheaton, during the entire year, snow falls for 17.1 days and aggregates up to 10.2" (259mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 30min of daylight.
On the first day of December, sunrise is at 7:08 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:55 pm EST.

Sunshine

In December, the average sunshine is 5.1h.

UV index

The months with the lowest UV index are January, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum UV index of 2 during December leads to these instructions:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Updated: Aug 18, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in December?

The high-temperature, in December, in Wheaton, is 45.3°F (7.4°C), while the low-temperature averages to 32.9°F (0.5°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in August is calculated to be 93.2°F (34°C).

What is the most humid month?

May, October and December, with an average relative humidity of 76%, are most humid months.

What is the average humidity in December in Wheaton?

In December, the average relative humidity is 76%.

How much does it rain in December?

In Wheaton, in December, it is raining for 10.2 days, with typically 2.76" (70mm) of accumulated precipitation.

How many days does it snow in December?

In December, it is snowing for 2.9 days. Throughout December, 1.38" (35mm) of snow is accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 30min of daylight.

How many hours of daylight does Wheaton have in December?

The average day length in December is 9h and 29min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:08 am and sunset at 4:46 pm. On the last day of the month, in Wheaton, sunrise is at 7:27 am and sunset at 4:55 pm EST.

How many hours of sunshine does Wheaton have in December?

In December, the average sunshine duration is 5.1h.

What is the month with the lowest UV index?

January, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index intensity in December?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Wheaton, MD

Average temperature in December - Wheaton, MD
  • Average high temperature in December: 45.3°F

The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (39°F).

  • Average low temperature in December: 32.9°F

The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

Average pressure in December
Wheaton, MD

Average pressure in December - Wheaton, MD
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in December
Wheaton, MD

Average wind speed in December - Wheaton, MD
  • Average wind speed in December: 7.1mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in December
Wheaton, MD

Average humidity in December - Wheaton, MD
  • Average humidity in December: 76%

The months with the highest relative humidity are May, October and December (76%).
The month with the lowest relative humidity is July (70%).

Average rainfall in December
Wheaton, MD

Average rainfall in December - Wheaton, MD
  • Average rainfall in December: 2.76"

The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (2.17").

Average rainfall days in December
Wheaton, MD

Average rainfall days in December - Wheaton, MD
  • Average rainfall days in December: 10.2 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is November (8.8 days).

Average snowfall in December
Wheaton, MD

Average snowfall in December - Wheaton, MD
  • Average snowfall in December: 1.38"

The months with the highest snowfall are January and March (3.03").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Wheaton, MD

Average snowfall days in December - Wheaton, MD
  • Average snowfall days in December: 2.9 days

The months with the highest number of snowfall days are January and February (5.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Wheaton, MD

Average daylight in December / Average sunshine in December - Wheaton, MD
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

Average sunshine days in December
Wheaton, MD

Average sunshine days in December - Wheaton, MD
  • Average sunshine days in December: 17.5 days

The month with the most sunshine days is November (19.4 days).
The months with the least sunshine days are May and July (11 days).

Average UV index in December
Wheaton, MD

Average UV index in December - Wheaton, MD
  • Average UV index in December: 2

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, November and December (UV index 2).

Average cloud cover in December
Wheaton, MD

Average cloud cover in December - Wheaton, MD
  • Average cloud cover in December: 45

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in December
Wheaton, MD

Average visibility in December - Wheaton, MD
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

Wheaton, Maryland, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location