December weather forecast
Rehrersburg, PA

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Weather in December

December, the first month of the winter in Rehrersburg, is also an icy month, with an average temperature varying between 40.5°F (4.7°C) and 29.3°F (-1.5°C).

Temperature

December signifies a gentle decline in Rehrersburg's average high-temperature, easing from a chilly 49.5°F (9.7°C) in November to a cold 40.5°F (4.7°C). In Rehrersburg, an average temperature of 29.3°F (-1.5°C) is noted during December nights.

Humidity

In Rehrersburg, the average relative humidity in December is 80%.

Rainfall

In Rehrersburg, Pennsylvania, in December, it is raining for 11.5 days, with typically 2.72" (69mm) of accumulated precipitation. In Rehrersburg, during the entire year, the rain falls for 168.8 days and collects up to 33.27" (845mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Rehrersburg, in December, during 5.4 snowfall days, 1.97" (50mm) of snow is typically accumulated. Throughout the year, there are 29.6 snowfall days, and 15.59" (396mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:09 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:28 am and sunset at 4:48 pm EST.

Sunshine

In December, the average sunshine is 4.6h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: In December, the maximum UV index of 2 transforms into these recommendations:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Around midday, solar radiation is most harmful; hence, exposure should be limited. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Updated: Aug 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in December?

The average high-temperature and low-temperature during December are 40.5°F (4.7°C) and 29.3°F (-1.5°C) respectively. The average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines air temperature and relative humidity, in July is estimated at 89.6°F (32°C).

What is the average humidity in December?

The average relative humidity in December is 80%.

How many days does it rain in December?

In December, the rain falls for 11.5 days. Throughout December, 2.72" (69mm) of precipitation is accumulated.

How many days does it snow in December?

In Rehrersburg, during December, snow falls for 5.4 days and regularly aggregates up to 1.97" (50mm) of snow.

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.

What is the average length of the day in December?

In Rehrersburg, the average day length in December is 9h and 20min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:09 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:48 pm EST.

How many hours of sunshine does Rehrersburg have in December?

The average sunshine duration in December is 4.6h.

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.

How high is the UV index in December?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability 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
Rehrersburg, PA

Average temperature in December - Rehrersburg, PA
  • Average high temperature in December: 40.5°F

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (33.6°F).

  • Average low temperature in December: 29.3°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).

Average pressure in December
Rehrersburg, PA

Average pressure in December - Rehrersburg, 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 (29.94"Hg).

Average wind speed in December
Rehrersburg, PA

Average wind speed in December - Rehrersburg, PA
  • Average wind speed in December: 8mph

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in December
Rehrersburg, PA

Average humidity in December - Rehrersburg, PA
  • Average humidity in December: 80%

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

Average rainfall in December
Rehrersburg, PA

Average rainfall in December - Rehrersburg, PA
  • Average rainfall in December: 2.72"

The wettest month (with the highest rainfall) is August (3.39").
The driest month (with the least rainfall) is September (2.24").

Average rainfall days in December
Rehrersburg, PA

Average rainfall days in December - Rehrersburg, PA
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is January (9.3 days).

Average snowfall in December
Rehrersburg, PA

Average snowfall in December - Rehrersburg, PA
  • Average snowfall in December: 1.97"

The month with the highest snowfall is March (4.49").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Rehrersburg, PA

Average snowfall days in December - Rehrersburg, PA
  • Average snowfall days in December: 5.4 days

The month with the highest number of snowfall days is January (9.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days in December
Rehrersburg, PA

Average sunshine days in December - Rehrersburg, PA
  • Average sunshine days in December: 14.9 days

The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is May (10.2 days).

Average UV index in December
Rehrersburg, PA

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

The month with the highest UV index is June (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
Rehrersburg, PA

Average cloud cover in December - Rehrersburg, PA
  • Average cloud cover in December: 50

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Rehrersburg, PA

Average visibility in December - Rehrersburg, PA
  • Average visibility in December: 6mi

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

Rehrersburg, Pennsylvania, USA

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