December weather forecast
Sterling, PA

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Weather in December

December, the first month of the winter in Sterling, is still a cold month, with an average temperature ranging between max 36.1°F (2.3°C) and min 25.3°F (-3.7°C).

Temperature

As Sterling enters December, the average high-temperature decreases from the a chilly 45.5°F (7.5°C) of November to an icy 36.1°F (2.3°C). During the nights in December, the temperature averages to a freezing cold 25.3°F (-3.7°C).

Humidity

The average relative humidity in December is 84%.

Rainfall

In December, the rain falls for 10.8 days. Throughout December, 2.83" (72mm) of precipitation is accumulated. In Sterling, during the entire year, the rain falls for 154.8 days and collects up to 32.24" (819mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In December, in Sterling, it is snowing for 13.2 days. Throughout December, 7.13" (181mm) of snow is accumulated. Throughout the year, there are 62.1 snowfall days, and 38.86" (987mm) of snow is accumulated.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year in Sterling.
On the first day of December, sunrise is at 7:08 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:42 pm EST.

Sunshine

The average sunshine in December is 3.9h.

UV index

With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: In December, the average maximum UV index of 1 translates into the following recommendations:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.

Frequently asked questions

How cold is it in December?

During December, Sterling experiences an average high-temperature of 36.1°F (2.3°C) and a low-temperature of 25.3°F (-3.7°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in July is computed to be 86°F (30°C).

What is the average humidity in December?

In Sterling, the average relative humidity in December is 84%.

How much does it rain in Sterling in December?

In Sterling, in December, it is raining for 10.8 days, with typically 2.83" (72mm) of accumulated precipitation.

How much does it snow in December?

In Sterling, in December, during 13.2 snowfall days, 7.13" (181mm) of snow is typically accumulated.

What is the month with the shortest days in Sterling?

December has the shortest days of the year, with an average of 9h and 12min of daylight.

How many hours of daylight does Sterling have in December?

In Sterling, the average day length in December is 9h and 15min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:08 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:42 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 3.9h.

What is the month with 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 reading in December?

In Sterling, the average daily maximum UV index in December 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
Sterling, PA

Average temperature in December - Sterling, PA
  • Average high temperature in December: 36.1°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (29.8°F).

  • Average low temperature in December: 25.3°F

The month with the highest average low temperature is July (59.5°F).
The coldest month (with the lowest average low temperature) is January (18°F).

Average pressure in December
Sterling, PA

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

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Sterling, PA

Average wind speed in December - Sterling, PA
  • Average wind speed in December: 8.1mph

The windiest months (with the highest average wind speed) are January and February (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in December
Sterling, PA

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

The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is July (77%).

Average rainfall in December
Sterling, PA

Average rainfall in December - Sterling, PA
  • Average rainfall in December: 2.83"

The wettest month (with the highest rainfall) is July (3.27").
The driest month (with the least rainfall) is September (1.85").

Average rainfall days in December
Sterling, PA

Average rainfall days in December - Sterling, PA
  • Average rainfall days in December: 10.8 days

The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is January (7.1 days).

Average snowfall in December
Sterling, PA

Average snowfall in December - Sterling, PA
  • Average snowfall in December: 7.13"

The month with the highest snowfall is February (8.03").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Sterling, PA

Average snowfall days in December - Sterling, PA
  • Average snowfall days in December: 13.2 days

The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Sterling, PA
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in December: 3h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).

Average sunshine days in December
Sterling, PA

Average sunshine days in December - Sterling, PA
  • Average sunshine days in December: 12.2 days

The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is May (10.9 days).

Average UV index in December
Sterling, PA

Average UV index in December - Sterling, 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
Sterling, PA

Average cloud cover in December - Sterling, PA
  • Average cloud cover in December: 60

The months with the most cloud cover are February and December (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 37).

Average visibility in December
Sterling, PA

Average visibility in December - Sterling, PA
  • Average visibility in December: 5mi

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

Sterling, Pennsylvania, USA

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