December weather forecast
Harris Heights, MD

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Weather in December

The first month of the winter, December, is also a frosty month in Harris Heights, Maryland, with an average temperature varying between 45.5°F (7.5°C) and 34.5°F (1.4°C).

Temperature

December marks a gentle change in average high-temperature, declining from November's cool 53.6°F (12°C) to a chilly 45.5°F (7.5°C). Throughout the nights in December, Harris Heights experiences an average low-temperature of 34.5°F (1.4°C).

Humidity

The average relative humidity in December is 76%.

Rainfall

In Harris Heights, in December, during 10.4 rainfall days, 2.32" (59mm) of precipitation is typically accumulated. Throughout the year, there are 157.2 rainfall days, and 30.47" (774mm) of precipitation is accumulated.

Snowfall

January through March, November and December are months with snowfall. In Harris Heights, in December, snow falls for 2.1 days, with typically accumulated 0.39" (10mm) of snow. In Harris Heights, during the entire year, snow falls for 11.9 days and aggregates up to 5.75" (146mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 30min of daylight.
On the first day of December, sunrise is at 7:07 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:53 pm EST.

Sunshine

In Harris Heights, the average sunshine in December is 5.2h.

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 unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.

Frequently asked questions

What is the average December temperature?

The high-temperature during December is 45.5°F (7.5°C) and the low-temperature is 34.5°F (1.4°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 evaluated at 91.4°F (33°C).

What is the average humidity in December?

In December, the average relative humidity is 76%.

How many days does it rain in December?

In Harris Heights, during December, the rain falls for 10.4 days and regularly aggregates up to 2.32" (59mm) of precipitation.

How many days does it snow in December?

In Harris Heights, in December, during 2.1 snowfall days, 0.39" (10mm) of snow is typically accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 30min of daylight.

How many hours of daylight does Harris Heights have in December?

The average day length in December in Harris Heights is 9h and 28min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:07 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:53 pm EST.

How many hours of sunshine does Harris Heights have in December?

In Harris Heights, the average sunshine duration in December is 5.2h.

When is the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index in Harris Heights is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's 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
Harris Heights, MD

Average temperature in December - Harris Heights, MD
  • Average high temperature in December: 45.5°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (38.8°F).

  • Average low temperature in December: 34.5°F

The month with the highest average low temperature is July (70.3°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).

Average pressure in December
Harris Heights, MD

Average pressure in December - Harris Heights, 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 (29.94"Hg).

Average wind speed in December
Harris Heights, MD

Average wind speed in December - Harris Heights, MD
  • Average wind speed in December: 8.5mph

The windiest months (with the highest average wind speed) are January, February and March (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).

Average humidity in December
Harris Heights, MD

Average humidity in December - Harris Heights, MD
  • Average humidity in December: 76%

The month with the highest relative humidity is May (77%).
The months with the lowest relative humidity are March, April and July (72%).

Average rainfall in December
Harris Heights, MD

Average rainfall in December - Harris Heights, MD
  • Average rainfall in December: 2.32"

The wettest month (with the highest rainfall) is August (4.09").
The driest month (with the least rainfall) is January (1.81").

Average rainfall days in December
Harris Heights, MD

Average rainfall days in December - Harris Heights, MD
  • Average rainfall days in December: 10.4 days

The month with the highest number of rainy days is May (18 days).
The months with the least rainy days are January and November (8.4 days).

Average snowfall in December
Harris Heights, MD

Average snowfall in December - Harris Heights, MD
  • Average snowfall in December: 0.39"

The month with the highest snowfall is January (2.09").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Harris Heights, MD

Average snowfall days in December - Harris Heights, MD
  • Average snowfall days in December: 2.1 days

The month with the highest number of snowfall days is January (3.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Harris Heights, MD

Average daylight in December / Average sunshine in December - Harris Heights, 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 54min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).

Average sunshine days in December
Harris Heights, MD

Average sunshine days in December - Harris Heights, MD
  • Average sunshine days in December: 18.4 days

The month with the most sunshine days is November (19.9 days).
The months with the least sunshine days are May and July (10.8 days).

Average UV index in December
Harris Heights, MD

Average UV index in December - Harris Heights, 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
Harris Heights, MD

Average cloud cover in December - Harris Heights, MD
  • Average cloud cover in December: 44

The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in December
Harris Heights, MD

Average visibility in December - Harris Heights, MD
  • Average visibility in December: 6mi

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

Harris Heights, Maryland, USA

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