December weather forecast
Chevy Chase Heights, PA

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Weather in December

The first month of the winter, December, is still a cold month in Chevy Chase Heights, Pennsylvania, with an average temperature varying between 27°F (-2.8°C) and 37.4°F (3°C).

Temperature

A change in temperatures is noted as November gives way to December, with average highs reducing from a chilly 47.1°F (8.4°C) to an icy 37.4°F (3°C). During December, Chevy Chase Heights's temperature falls to a steady low-temperature average of 27°F (-2.8°C).

Humidity

The average relative humidity in December is 85%.

Rainfall

In Chevy Chase Heights, in December, it is raining for 11.9 days, with typically 2.76" (70mm) of accumulated precipitation. In Chevy Chase Heights, during the entire year, the rain falls for 183.5 days and collects up to 33.46" (850mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Chevy Chase Heights, during December, snow falls for 13.1 days and regularly aggregates up to 5.67" (144mm) of snow. In Chevy Chase Heights, during the entire year, snow falls for 67.3 days and aggregates up to 28.62" (727mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 7:21 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 4:59 pm EST.

Sunshine

In December, the average sunshine is 3.2h.

UV index

With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index, 1 in December, converts into the following recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Experience reduced UV exposure by about half when donning a wide-brim hat. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.

Frequently asked questions

How cold is December in Chevy Chase Heights?

Chevy Chase Heights in December has an average high-temperature of 37.4°F (3°C) and an average low-temperature of 27°F (-2.8°C). In July, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 86°F (30°C).

What is the average humidity in December?

The average relative humidity in December is 85%.

How much does it rain in December?

In Chevy Chase Heights, in December, during 11.9 rainfall days, 2.76" (70mm) of precipitation is typically accumulated.

How much does it snow in December?

In December, it is snowing for 13.1 days. Throughout December, 5.67" (144mm) 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 18min of daylight.

How many hours of daylight does Chevy Chase Heights have in December?

In December, the average day length is 9h and 19min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:21 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 4:59 pm EST.

How many hours of sunshine does Chevy Chase Heights have in December?

The average sunshine duration in December is 3.2h.

When is the lowest UV index?

December is the month with the lowest UV index, with an average maximum UV index of 1.

What is the UV index intensity in December?

In December, the average daily maximum UV index is 1. A UV Index estimate of 2, and below, represents a low health risk from unsafe 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
Chevy Chase Heights, PA

Average temperature in December - Chevy Chase Heights, PA
  • Average high temperature in December: 37.4°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.3°F).

  • Average low temperature in December: 27°F

The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (19°F).

Average pressure in December
Chevy Chase Heights, PA

Average pressure in December - Chevy Chase Heights, PA
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in December
Chevy Chase Heights, PA

Average wind speed in December - Chevy Chase Heights, PA
  • Average wind speed in December: 8.8mph

The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in December
Chevy Chase Heights, PA

Average humidity in December - Chevy Chase Heights, PA
  • Average humidity in December: 85%

The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are April, June, July and August (78%).

Average rainfall in December
Chevy Chase Heights, PA

Average rainfall in December - Chevy Chase Heights, PA
  • Average rainfall in December: 2.76"

The wettest month (with the highest rainfall) is May (3.62").
The driest month (with the least rainfall) is November (1.93").

Average rainfall days in December
Chevy Chase Heights, PA

Average rainfall days in December - Chevy Chase Heights, PA
  • Average rainfall days in December: 11.9 days

The month with the highest number of rainy days is May (21.5 days).
The month with the least rainy days is January (9.1 days).

Average snowfall in December
Chevy Chase Heights, PA

Average snowfall in December - Chevy Chase Heights, PA
  • Average snowfall in December: 5.67"

The month with the highest snowfall is January (7.05").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Chevy Chase Heights, PA

Average snowfall days in December - Chevy Chase Heights, PA
  • Average snowfall days in December: 13.1 days

The month with the highest number of snowfall days is January (17.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Chevy Chase Heights, PA

Average daylight in December / Average sunshine in December - Chevy Chase Heights, 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 18min).

  • Average sunshine in December: 3h and 1min

The months with the most sunshine are July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).

Average sunshine days in December
Chevy Chase Heights, PA

Average sunshine days in December - Chevy Chase Heights, PA
  • Average sunshine days in December: 9.8 days

The month with the most sunshine days is November (13.3 days).
The month with the least sunshine days is February (7.3 days).

Average UV index in December
Chevy Chase Heights, PA

Average UV index in December - Chevy Chase Heights, PA
  • Average UV index in December: 1

The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Chevy Chase Heights, PA

Average cloud cover in December - Chevy Chase Heights, PA
  • Average cloud cover in December: 68

The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is August (Cloud cover 37).

Average visibility in December
Chevy Chase Heights, PA

Average visibility in December - Chevy Chase Heights, PA
  • Average visibility in December: 5mi

The month with the highest visibility is April (6mi).
The months with the lowest visibility are January and February (4mi).

Chevy Chase Heights, Pennsylvania, USA

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