December weather forecast
Rismiller, PA

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Weather in December

The first month of the winter, December, is also a wintry month in Rismiller, Pennsylvania, with an average temperature varying between 27.5°F (-2.5°C) and 39°F (3.9°C).

Temperature

In the transition to December, Rismiller observes a drop in the average high-temperature, moving from a frosty 48.4°F (9.1°C) in November to a cold 39°F (3.9°C). During December, Rismiller experiences a consistent low-temperature average of 27.5°F (-2.5°C).

Humidity

In Rismiller, Pennsylvania, the average relative humidity in December is 81%.

Rainfall

In Rismiller, in December, it is raining for 9.4 days, with typically 1.73" (44mm) of accumulated precipitation. Throughout the year, there are 139.9 rainfall days, and 19.88" (505mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Rismiller, in December, during 4.1 snowfall days, 2.32" (59mm) of snow is typically accumulated. Throughout the year, there are 24.7 snowfall days, and 10.94" (278mm) of snow is accumulated.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year in Rismiller.
On the first day of December, sunrise is at 7:06 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:43 pm EST.

Sunshine

The average sunshine in December is 4.7h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The UV index of 1 in December translates into these instructions:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Updated: Aug 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold in Rismiller?

December temperatures vary between a high-temperature of 39°F (3.9°C) and a low-temperature of 27.5°F (-2.5°C). In July, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is estimated at 89.6°F (32°C).

What is the average humidity in December?

In Rismiller, the average relative humidity in December is 81%.

How many days does it rain in December?

In December, the rain falls for 9.4 days. Throughout December, 1.73" (44mm) of precipitation is accumulated.

How much does it snow in December?

In Rismiller, in December, snow falls for 4.1 days, with typically accumulated 2.32" (59mm) of snow.

What is the month with the shortest days?

With an average of 9h and 18min of daylight, December has the shortest days of the year.

What is the average length of the day in December in Rismiller?

The average day length in December is 9h and 18min.

When is the sunrise / sunset in December in Rismiller?

In December, on the first day of the month, sunrise is at 7:06 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:43 pm EST.

How long on average sun shines in December?

The average sunshine duration in December in Rismiller, Pennsylvania, is 4.7h.

What is the month with the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health 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
Rismiller, PA

Average temperature in December - Rismiller, PA
  • Average high temperature in December: 39°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in December: 27.5°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).

Average pressure in December
Rismiller, PA

Average pressure in December - Rismiller, 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
Rismiller, PA

Average wind speed in December - Rismiller, PA
  • Average wind speed in December: 7.5mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

Average humidity in December
Rismiller, PA

Average humidity in December - Rismiller, PA
  • Average humidity in December: 81%

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (76%).

Average rainfall in December
Rismiller, PA

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

The wettest month (with the highest rainfall) is July (2.32").
The driest month (with the least rainfall) is September (1.02").

Average rainfall days in December
Rismiller, PA

Average rainfall days in December - Rismiller, PA
  • Average rainfall days in December: 9.4 days

The month with the highest number of rainy days is July (15.1 days).
The month with the least rainy days is January (7.3 days).

Average snowfall in December
Rismiller, PA

Average snowfall in December - Rismiller, PA
  • Average snowfall in December: 2.32"

The month with the highest snowfall is February (2.52").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Rismiller, PA

Average snowfall days in December - Rismiller, PA
  • Average snowfall days in December: 4.1 days

The month with the highest number of snowfall days is February (6.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

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 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
Rismiller, PA

Average sunshine days in December - Rismiller, PA
  • Average sunshine days in December: 17.9 days

The month with the most sunshine days is January (19.3 days).
The month with the least sunshine days is July (13 days).

Average UV index in December
Rismiller, PA

Average UV index in December - Rismiller, PA
  • Average UV index in December: 1

The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Rismiller, PA

Average cloud cover in December - Rismiller, 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 34).

Average visibility in December
Rismiller, PA

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

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

Rismiller, Pennsylvania, USA

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