December weather forecast
Grindstone, PA

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Weather in December

The first month of the winter, December, is still a cold month in Grindstone, Pennsylvania, with an average temperature ranging between min 28.8°F (-1.8°C) and max 40.1°F (4.5°C).

Temperature

December involves a decrease in temperature, down from a cool 50°F (10°C) in November to an icy 40.1°F (4.5°C). Grindstone's average low-temperature for the month of December records at a subzero cold 28.8°F (-1.8°C).

Humidity

The average relative humidity in December in Grindstone is 83%.

Rainfall

In Grindstone, Pennsylvania, in December, it is raining for 5 days, with typically 0.51" (13mm) of accumulated precipitation. Throughout the year, there are 82.6 rainfall days, and 6.1" (155mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall. The months with the most snowfall are February and December, with an average 0.35" (9mm) of accumulated snow.

Daylight

The month with the shortest days in Grindstone is December, with an average of 9h and 24min of daylight.
On the first day of December, sunrise is at 7:22 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 5:04 pm EST.

Sunshine

In December, the average sunshine is 3.5h.

UV index

The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: A daily high UV index of 2 in December leads to these guidelines:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. When the Sun is at its strongest around midday, find shade and limit exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Updated: Aug 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in December?

Grindstone in December has an average high-temperature of 40.1°F (4.5°C) and an average low-temperature of 28.8°F (-1.8°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, in August is estimated at 87.8°F (31°C).

What is the average humidity in December?

In December, the average relative humidity is 83%.

How many days does it rain in December?

In Grindstone, Pennsylvania, in December, during 5 rainfall days, 0.51" (13mm) of precipitation is typically accumulated.

When does it snow the most?

The months with the most snowfall are February and December, with an average 0.35" (9mm) of accumulated snow.

How many days does it snow in December in Grindstone?

In Grindstone, in December, during 3.6 snowfall days, 0.35" (9mm) of snow is typically accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 23min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:22 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 5:04 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 3.5h.

When is the lowest UV index?

The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2.

What is the UV index intensity in December?

In Grindstone, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat 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
Grindstone, PA

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

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (34.3°F).

  • Average low temperature in December: 28.8°F

The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).

Average pressure in December
Grindstone, PA

Average pressure in December - Grindstone, 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
Grindstone, PA

Average wind speed in December - Grindstone, PA
  • Average wind speed in December: 7.2mph

The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).

Average humidity in December
Grindstone, PA

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

The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are April, July, August and November (77%).

Average rainfall in December
Grindstone, PA

Average rainfall in December - Grindstone, PA
  • Average rainfall in December: 0.51"

The wettest month (with the highest rainfall) is May (0.71").
The driest month (with the least rainfall) is September (0.28").

Average rainfall days in December
Grindstone, PA

Average rainfall days in December - Grindstone, PA
  • Average rainfall days in December: 5 days

The month with the highest number of rainy days is July (9.8 days).
The month with the least rainy days is February (4 days).

Average snowfall in December
Grindstone, PA

Average snowfall in December - Grindstone, PA
  • Average snowfall in December: 0.35"

The months with the highest snowfall are February and December (0.35").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Grindstone, PA

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

The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Grindstone, 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 6min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in December
Grindstone, PA

Average sunshine days in December - Grindstone, PA
  • Average sunshine days in December: 22.4 days

The month with the most sunshine days is November (23.2 days).
The month with the least sunshine days is June (17.3 days).

Average UV index in December
Grindstone, PA

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

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

Average cloud cover in December
Grindstone, PA

Average cloud cover in December - Grindstone, 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
Grindstone, PA

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

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

Grindstone, Pennsylvania, USA

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