December weather forecast
Chillum, MD

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Weather in December

The first month of the winter, December, is also a frosty month in Chillum, Maryland, with an average temperature fluctuating between 45.3°F (7.4°C) and 33.3°F (0.7°C).

Temperature

December is characterized by a slight reduction in average high-temperature, easing from a fresh 53.6°F (12°C) in November to a frosty 45.3°F (7.4°C). December nights observe an average temperature dip to an icy 33.3°F (0.7°C).

Humidity

The months with the highest humidity are May, October and December, with an average relative humidity of 75%.

Rainfall

In December, the rain falls for 10.4 days. Throughout December, 2.44" (62mm) of precipitation is accumulated. Throughout the year, there are 154.8 rainfall days, and 30.28" (769mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In Chillum, during December, snow falls for 2.5 days and regularly aggregates up to 1.34" (34mm) of snow. Throughout the year, there are 15 snowfall days, and 9.17" (233mm) of snow is accumulated.

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 7:26 am and sunset at 4:55 pm EST.

Sunshine

The average sunshine in December is 5h.

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 of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: The UV index of 2 in December translates into these instructions:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.

Frequently asked questions

What is the temperature in December?

During December, Chillum experiences an average high-temperature of 45.3°F (7.4°C) and a low-temperature of 33.3°F (0.7°C). The average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, in August is computed to be 95°F (35°C).

What are the most humid months?

The months with the highest humidity are May, October and December, with an average relative humidity of 75%.

What is the average humidity in December?

The average relative humidity in December in Chillum is 75%.

How many days does it rain in December?

In December, the rain falls for 10.4 days. Throughout December, 2.44" (62mm) of precipitation is accumulated.

How much does it snow in December?

In Chillum, in December, during 2.5 snowfall days, 1.34" (34mm) of snow is typically 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 Chillum have in December?

In December, the average day length 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, sunrise is at 7:26 am and sunset at 4:55 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 5h.

What is the month with the lowest UV index?

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

What is the UV index reading in December?

In Chillum, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to Sun's UV rays.
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
Chillum, MD

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

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.7°F).

  • Average low temperature in December: 33.3°F

The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (27.1°F).

Average pressure in December
Chillum, MD

Average pressure in December - Chillum, 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
Chillum, MD

Average wind speed in December - Chillum, 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 (5.2mph).

Average humidity in December
Chillum, MD

Average humidity in December - Chillum, MD
  • Average humidity in December: 75%

The months with the highest relative humidity are May, October and December (75%).
The month with the lowest relative humidity is July (69%).

Average rainfall in December
Chillum, MD

Average rainfall in December - Chillum, MD
  • Average rainfall in December: 2.44"

The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is January (1.89").

Average rainfall days in December
Chillum, MD

Average rainfall days in December - Chillum, MD
  • Average rainfall days in December: 10.4 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is November (8.5 days).

Average snowfall in December
Chillum, MD

Average snowfall in December - Chillum, MD
  • Average snowfall in December: 1.34"

The month with the highest snowfall is January (2.87").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Chillum, MD

Average snowfall days in December - Chillum, MD
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is January (4.6 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
Chillum, MD

Average daylight in December / Average sunshine in December - Chillum, 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 0min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

Average sunshine days in December
Chillum, MD

Average sunshine days in December - Chillum, MD
  • Average sunshine days in December: 17.7 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is May (12 days).

Average UV index in December
Chillum, MD

Average UV index in December - Chillum, 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
Chillum, MD

Average cloud cover in December - Chillum, MD
  • Average cloud cover in December: 46

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Chillum, MD

Average visibility in December - Chillum, 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).

Chillum, Maryland, USA

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