December weather forecast
Greisemersville, PA

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Weather in December

December, the first month of the winter in Greisemersville, is also an icy month, with an average temperature ranging between min 30°F (-1.1°C) and max 41.4°F (5.2°C).

Temperature

The beginning of December subtly marks a decrease in the average high-temperature, transitioning from a cool 50.4°F (10.2°C) in November to an icy 41.4°F (5.2°C). An average low-temperature of 30°F (-1.1°C) is common during the nights of December.

Humidity

In December, the average relative humidity is 80%.

Rainfall

In Greisemersville, in December, during 11.1 rainfall days, 2.24" (57mm) of precipitation is typically accumulated. In Greisemersville, during the entire year, the rain falls for 162.2 days and collects up to 27.87" (708mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Greisemersville, in December, snow falls for 3.6 days, with typically accumulated 1.42" (36mm) of snow. Throughout the year, there are 22.9 snowfall days, and 10.35" (263mm) of snow is accumulated.

Daylight

With an average of 9h and 24min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:07 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:46 pm EST.

Sunshine

The average sunshine in December is 4.9h.

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 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 translates into these guidelines:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. Avoiding the Sun during its peak radiation time around midday is a healthy practice. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Updated: Aug 31, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The high-temperature, in December, in Greisemersville, records 41.4°F (5.2°C), while the low-temperature is 30°F (-1.1°C). The average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, in August is estimated at 86°F (30°C).

What is the average humidity in December?

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

How many days does it rain in December?

In December, the rain falls for 11.1 days. Throughout December, 2.24" (57mm) of precipitation is accumulated.

How much does it snow in December?

In Greisemersville, in December, during 3.6 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.

What is the average length of the day in December?

The average day length in December is 9h and 21min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:07 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:46 pm EST.

How many hours of sunshine does Greisemersville have in December?

The average sunshine duration in December is 4.9h.

When is the lowest UV index in Greisemersville?

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?

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health threat 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
Greisemersville, PA

Average temperature in December - Greisemersville, PA
  • Average high temperature in December: 41.4°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (35.2°F).

  • Average low temperature in December: 30°F

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (22.8°F).

Average pressure in December
Greisemersville, PA

Average pressure in December - Greisemersville, PA
  • Average pressure in December: 30.09"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
Greisemersville, PA

Average wind speed in December - Greisemersville, PA
  • Average wind speed in December: 7.8mph

The windiest months (with the highest average wind speed) are January and March (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in December
Greisemersville, PA

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

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

Average rainfall in December
Greisemersville, PA

Average rainfall in December - Greisemersville, PA
  • Average rainfall in December: 2.24"

The wettest month (with the highest rainfall) is August (2.83").
The driest month (with the least rainfall) is September (1.77").

Average rainfall days in December
Greisemersville, PA

Average rainfall days in December - Greisemersville, PA
  • Average rainfall days in December: 11.1 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (9.4 days).

Average snowfall in December
Greisemersville, PA

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

The month with the highest snowfall is March (3.03").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Greisemersville, PA

Average snowfall days in December - Greisemersville, PA
  • Average snowfall days in December: 3.6 days

The month with the highest number of snowfall days is January (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Greisemersville, 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: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in December
Greisemersville, PA

Average sunshine days in December - Greisemersville, PA
  • Average sunshine days in December: 15.9 days

The month with the most sunshine days is November (17.8 days).
The month with the least sunshine days is May (11.6 days).

Average UV index in December
Greisemersville, PA

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

The months with the highest UV index are May, June and 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
Greisemersville, PA

Average cloud cover in December - Greisemersville, PA
  • Average cloud cover in December: 49

The months with the most cloud cover are February and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in December
Greisemersville, PA

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

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

Greisemersville, Pennsylvania, USA

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