December weather forecast
Graysville, PA

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Weather in December

December, the first month of the winter in Graysville, is also an icy month, with an average temperature varying between 40.1°F (4.5°C) and 28.6°F (-1.9°C).

Temperature

In December, the average high-temperature decreases from a frosty 49.8°F (9.9°C) in November to a wintry 40.1°F (4.5°C). In the month of December, Graysville experiences an average low-temperature of 28.6°F (-1.9°C).

Humidity

The average relative humidity in December is 83%.

Rainfall

In Graysville, in December, during 13.2 rainfall days, 3.11" (79mm) of precipitation is typically accumulated. Throughout the year, there are 184.2 rainfall days, and 35.75" (908mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Graysville, in December, during 12.9 snowfall days, 5" (127mm) of snow is typically accumulated. In Graysville, during the entire year, snow falls for 61.5 days and aggregates up to 25.98" (660mm) of snow.

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 7:24 am and sunset at 4:57 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 5:06 pm EST.

Sunshine

In Graysville, the average sunshine in December is 3.5h.

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 estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for average individuals.
Note: In December, a regular UV index of 2 translates into these guidelines:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Updated: Aug 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in December?

December temperatures vary between a high-temperature of 40.1°F (4.5°C) and a low-temperature of 28.6°F (-1.9°C). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, is estimated at 87.8°F (31°C).

What is the average humidity in December in Graysville?

In December, the average relative humidity is 83%.

How much does it rain in Graysville in December?

In December, the rain falls for 13.2 days. Throughout December, 3.11" (79mm) of precipitation is accumulated.

How many days does it snow in December?

In Graysville, in December, during 12.9 snowfall days, 5" (127mm) 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 23min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:24 am and sunset at 4:57 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 5:06 pm EST.

How long on average sun shines in December?

The average sunshine duration in December is 3.5h.

When is the lowest UV index?

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

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from 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
Graysville, PA

Average temperature in December - Graysville, PA
  • Average high temperature in December: 40.1°F

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (34.3°F).

  • Average low temperature in December: 28.6°F

The month with the highest average low temperature is July (61.7°F).
The coldest month (with the lowest average low temperature) is January (21°F).

Average pressure in December
Graysville, PA

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

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in December
Graysville, PA

Average wind speed in December - Graysville, PA
  • Average wind speed in December: 7mph

The windiest month (with the highest average wind speed) is January (7.6mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

Average humidity in December
Graysville, PA

Average humidity in December - Graysville, PA
  • Average humidity in December: 83%

The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are April, July and August (77%).

Average rainfall in December
Graysville, PA

Average rainfall in December - Graysville, PA
  • Average rainfall in December: 3.11"

The wettest month (with the highest rainfall) is May (3.66").
The driest month (with the least rainfall) is November (2.24").

Average rainfall days in December
Graysville, PA

Average rainfall days in December - Graysville, PA
  • Average rainfall days in December: 13.2 days

The month with the highest number of rainy days is May (20.8 days).
The month with the least rainy days is January (10.7 days).

Average snowfall in December
Graysville, PA

Average snowfall in December - Graysville, PA
  • Average snowfall in December: 5"

The month with the highest snowfall is February (6.54").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Graysville, PA

Average snowfall days in December - Graysville, PA
  • Average snowfall days in December: 12.9 days

The month with the highest number of snowfall days is January (17.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Graysville, 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: 3h and 3min

The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in December
Graysville, PA

Average sunshine days in December - Graysville, PA
  • Average sunshine days in December: 10.4 days

The month with the most sunshine days is November (15.5 days).
The month with the least sunshine days is January (7.5 days).

Average UV index in December
Graysville, PA

Average UV index in December - Graysville, 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, November and December (UV index 2).

Average cloud cover in December
Graysville, PA

Average cloud cover in December - Graysville, PA
  • Average cloud cover in December: 64

The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 35).

Average visibility in December
Graysville, PA

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

The month with the highest visibility is April (6mi).
The months with the lowest visibility are January and February (4mi).

Graysville, Pennsylvania, USA

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