December weather forecast
Stewartstown, PA

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Weather in December

The first month of the winter, December, is still a cold month in Stewartstown, Pennsylvania, with an average temperature ranging between max 42.3°F (5.7°C) and min 30.7°F (-0.7°C).

Temperature

The onset of December results in a small decrease in the average high-temperature, moderately receding from a fresh 51.1°F (10.6°C) in November to a wintry 42.3°F (5.7°C). December's average low-temperature reading settles at a subzero cold 30.7°F (-0.7°C).

Humidity

In December, the average relative humidity is 79%.

Rainfall

In Stewartstown, in December, during 9.2 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. In Stewartstown, during the entire year, the rain falls for 145.3 days and collects up to 24.88" (632mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In December, it is snowing for 2.9 days. Throughout December, 1.42" (36mm) of snow is accumulated. Throughout the year, there are 19.2 snowfall days, and 10.59" (269mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of December, sunrise is at 7:08 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:52 pm EST.

Sunshine

In December, the average sunshine is 5h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the average person.
Note: The maximum UV index of 2 during December leads to these instructions:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Updated: Jun 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

During December, Stewartstown experiences an average high-temperature of 42.3°F (5.7°C) and a low-temperature of 30.7°F (-0.7°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is calculated to be 86°F (30°C).

What is the average humidity in December?

The average relative humidity in December is 79%.

How many days does it rain in December?

In Stewartstown, during December, the rain falls for 9.2 days and regularly aggregates up to 1.73" (44mm) of precipitation.

How much does it snow in December?

In Stewartstown, in December, during 2.9 snowfall days, 1.42" (36mm) of snow is typically accumulated.

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.

How many hours of daylight does Stewartstown have in December?

In December, the average day length is 9h and 25min.

When are sunrise and sunset in December in Stewartstown?

On the first day of December, sunrise is at 7:08 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:52 pm EST.

How long on average sun shines in December?

In Stewartstown, the average sunshine duration in December is 5h.

What is the month with the lowest UV index in Stewartstown?

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

How high is the UV index in December?

In Stewartstown, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents 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
Stewartstown, PA

Average temperature in December - Stewartstown, PA
  • Average high temperature in December: 42.3°F

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in December: 30.7°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).

Average pressure in December
Stewartstown, PA

Average pressure in December - Stewartstown, PA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Stewartstown, PA

Average wind speed in December - Stewartstown, PA
  • Average wind speed in December: 8.2mph

The windiest months (with the highest average wind speed) are February and March (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in December
Stewartstown, PA

Average humidity in December - Stewartstown, PA
  • Average humidity in December: 79%

The month with the highest relative humidity is May (81%).
The months with the lowest relative humidity are January, March, April and November (76%).

Average rainfall in December
Stewartstown, PA

Average rainfall in December - Stewartstown, PA
  • Average rainfall in December: 1.73"

The wettest month (with the highest rainfall) is August (3.03").
The driest month (with the least rainfall) is February (1.38").

Average rainfall days in December
Stewartstown, PA

Average rainfall days in December - Stewartstown, PA
  • Average rainfall days in December: 9.2 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (6.5 days).

Average snowfall in December
Stewartstown, PA

Average snowfall in December - Stewartstown, PA
  • Average snowfall in December: 1.42"

The month with the highest snowfall is March (3.43").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Stewartstown, PA

Average snowfall days in December - Stewartstown, PA
  • Average snowfall days in December: 2.9 days

The month with the highest number of snowfall days is January (5.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

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 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 42min).

Average sunshine days in December
Stewartstown, PA

Average sunshine days in December - Stewartstown, PA
  • Average sunshine days in December: 19 days

The month with the most sunshine days is November (20.1 days).
The month with the least sunshine days is May (11.1 days).

Average UV index in December
Stewartstown, PA

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

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Stewartstown, PA

Average cloud cover in December - Stewartstown, PA
  • Average cloud cover in December: 46

The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in December
Stewartstown, PA

Average visibility in December - Stewartstown, 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).

Stewartstown, Pennsylvania, USA

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