December weather forecast
Donnelly, PA

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Weather in December

The first month of the winter, December, is also a wintry month in Donnelly, Pennsylvania, with an average temperature varying between 27.7°F (-2.4°C) and 39.2°F (4°C).

Temperature

In December, the average high-temperature goes from a frosty 48.9°F (9.4°C) in November to an icy 39.2°F (4°C). In Donnelly, the December nights cool down to an average low of 27.7°F (-2.4°C).

Humidity

The average relative humidity in December is 84%.

Rainfall

In Donnelly, in December, during 13.1 rainfall days, 3.03" (77mm) of precipitation is typically accumulated. Throughout the year, there are 185.4 rainfall days, and 34.02" (864mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Donnelly, in December, snow falls for 12.8 days, with typically accumulated 6.1" (155mm) of snow. In Donnelly, during the entire year, snow falls for 63.2 days and aggregates up to 29.02" (737mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:22 am and sunset at 4:53 pm. On the last day of December, sunrise is at 7:40 am and sunset at 5:02 pm EST.

Sunshine

In December, the average sunshine is 3.6h.

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 of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 2 translates into the following recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Take note! UV radiation from the Sun can double in intensity due to snow reflection.

Frequently asked questions

How cold is December?

An average high-temperature, in December, in Donnelly, is 39.2°F (4°C) and the average low-temperature is 27.7°F (-2.4°C). In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines air temperature and relative humidity, is computed to be 84.2°F (29°C).

What is the average humidity in December?

In December, the average relative humidity is 84%.

How much does it rain in December?

In Donnelly, in December, during 13.1 rainfall days, 3.03" (77mm) of precipitation is typically accumulated.

How many days does it snow in December?

In December, it is snowing for 12.8 days. Throughout December, 6.1" (155mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

How many hours of daylight does Donnelly have in December?

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

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:22 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 5:02 pm EST.

How many hours of sunshine does Donnelly have in December?

The average sunshine duration in December is 3.6h.

What is the month with 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.

What is the UV index intensity in December?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability 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
Donnelly, PA

Average temperature in December - Donnelly, PA
  • Average high temperature in December: 39.2°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.3°F).

  • Average low temperature in December: 27.7°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).

Average pressure in December
Donnelly, PA

Average pressure in December - Donnelly, PA
  • 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
Donnelly, PA

Average wind speed in December - Donnelly, PA
  • Average wind speed in December: 7.9mph

The windiest month (with the highest average wind speed) is January (8.5mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in December
Donnelly, PA

Average humidity in December - Donnelly, PA
  • Average humidity in December: 84%

The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are April, July and August (77%).

Average rainfall in December
Donnelly, PA

Average rainfall in December - Donnelly, PA
  • Average rainfall in December: 3.03"

The wettest month (with the highest rainfall) is May (3.66").
The driest month (with the least rainfall) is November (2.01").

Average rainfall days in December
Donnelly, PA

Average rainfall days in December - Donnelly, PA
  • Average rainfall days in December: 13.1 days

The month with the highest number of rainy days is May (22 days).
The month with the least rainy days is January (9.8 days).

Average snowfall in December
Donnelly, PA

Average snowfall in December - Donnelly, PA
  • Average snowfall in December: 6.1"

The month with the highest snowfall is January (7.09").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Donnelly, PA

Average snowfall days in December - Donnelly, PA
  • Average snowfall days in December: 12.8 days

The month with the highest number of snowfall days is January (17.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Donnelly, PA

Average daylight in December / Average sunshine in December - Donnelly, 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: 3h and 4min

The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in December
Donnelly, PA

Average sunshine days in December - Donnelly, PA
  • Average sunshine days in December: 9.7 days

The month with the most sunshine days is November (13.5 days).
The month with the least sunshine days is January (6.5 days).

Average UV index in December
Donnelly, PA

Average UV index in December - Donnelly, PA
  • Average UV index in December: 2

The month with the highest UV index is July (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
Donnelly, PA

Average cloud cover in December - Donnelly, PA
  • Average cloud cover in December: 64

The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 35).

Average visibility in December
Donnelly, PA

Average visibility in December - Donnelly, 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).

Donnelly, Pennsylvania, USA

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