December weather forecast
Fort Washington, PA

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Weather in December

The first month of the winter, December, is also a frosty month in Fort Washington, Pennsylvania, with an average temperature ranging between min 31.6°F (-0.2°C) and max 42.8°F (6°C).

Temperature

During the transition into December, Fort Washington observes a decrease in the average high-temperature, falling from a cool 52.2°F (11.2°C) in November to a chilly 42.8°F (6°C). December's nights observe an average temperature of 31.6°F (-0.2°C).

Humidity

February, October and December, with an average relative humidity of 78%, are the most humid months.

Rainfall

In Fort Washington, in December, it is raining for 7.5 days, with typically 1.14" (29mm) of accumulated precipitation. In Fort Washington, during the entire year, the rain falls for 122.4 days and collects up to 12.68" (322mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In December, it is snowing for 2.5 days. Throughout December, 0.71" (18mm) of snow is accumulated. In Fort Washington, during the entire year, snow falls for 16.3 days and aggregates up to 4.72" (120mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:04 am and sunset at 4:35 pm. On the last day of December, in Fort Washington, sunrise is at 7:22 am and sunset at 4:45 pm EST.

Sunshine

In Fort Washington, the average sunshine in December is 5h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for average individuals.
Note: A maximum daily UV index of 2 during December morphs into the following directions:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Enhance your sun protection with tightly woven, yet airy clothing. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.

Frequently asked questions

How cold does it get in Fort Washington in December?

The high-temperature during December is 42.8°F (6°C) and the low-temperature is 31.6°F (-0.2°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is computed to be 89.6°F (32°C).

What are the most humid months?

The months with the highest humidity are February, October and December, with an average relative humidity of 78%.

What is the average humidity in December?

The average relative humidity in December is 78%.

How much does it rain in December?

In Fort Washington, in December, during 7.5 rainfall days, 1.14" (29mm) of precipitation is typically accumulated.

How much does it snow in December?

In Fort Washington, in December, snow falls for 2.5 days, with typically accumulated 0.71" (18mm) of snow.

What is the month with the shortest days?

With an average of 9h and 24min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

In Fort Washington, the average day length in December is 9h and 22min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:04 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:45 pm EST.

How long on average sun shines in December?

The average sunshine duration in December is 5h.

When is the lowest UV index?

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

How high is the UV index in December?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health threat 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
Fort Washington, PA

Average temperature in December - Fort Washington, PA
  • Average high temperature in December: 42.8°F

The warmest month (with the highest average high temperature) is July (86.2°F).
The month with the lowest average high temperature is January (36.7°F).

  • Average low temperature in December: 31.6°F

The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).

Average pressure in December
Fort Washington, PA

Average pressure in December - Fort Washington, PA
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Fort Washington, PA

Average wind speed in December - Fort Washington, PA
  • Average wind speed in December: 7.6mph

The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in December
Fort Washington, PA

Average humidity in December - Fort Washington, PA
  • Average humidity in December: 78%

The months with the highest relative humidity are February, October and December (78%).
The months with the lowest relative humidity are April, July and August (72%).

Average rainfall in December
Fort Washington, PA

Average rainfall in December - Fort Washington, PA
  • Average rainfall in December: 1.14"

The wettest month (with the highest rainfall) is August (1.54").
The driest month (with the least rainfall) is September (0.75").

Average rainfall days in December
Fort Washington, PA

Average rainfall days in December - Fort Washington, PA
  • Average rainfall days in December: 7.5 days

The month with the highest number of rainy days is May (14.1 days).
The month with the least rainy days is November (6.4 days).

Average snowfall in December
Fort Washington, PA

Average snowfall in December - Fort Washington, PA
  • Average snowfall in December: 0.71"

The month with the highest snowfall is February (1.46").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Fort Washington, PA

Average snowfall days in December - Fort Washington, PA
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is January (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
Fort Washington, PA

Average daylight in December / Average sunshine in December - Fort Washington, PA
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 5h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in December
Fort Washington, PA

Average sunshine days in December - Fort Washington, PA
  • Average sunshine days in December: 20.9 days

The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is May (14.4 days).

Average UV index in December
Fort Washington, PA

Average UV index in December - Fort Washington, PA
  • 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, February, March, November and December (UV index 2).

Average cloud cover in December
Fort Washington, PA

Average cloud cover in December - Fort Washington, PA
  • Average cloud cover in December: 47

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in December
Fort Washington, PA

Average visibility in December - Fort Washington, PA
  • Average visibility in December: 6mi

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

Fort Washington, Pennsylvania, USA

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