Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
A moderate decline in the average high-temperature is seen during December, decreasing from a chilly 48.7°F (9.3°C) in November to an icy 39°F (3.9°C). During the month of December, an average temperature of 27.9°F (-2.3°C) is noted during the nights.Humidity
The average relative humidity in December in Grapeville, Pennsylvania, is 84%.Rainfall
In Grapeville, in December, it is raining for 13.5 days, with typically 3.07" (78mm) of accumulated precipitation. Throughout the year, there are 186 rainfall days, and 34.84" (885mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In December, it is snowing for 12.8 days. Throughout December, 5.67" (144mm) of snow is accumulated. In Grapeville, during the entire year, snow falls for 63.3 days and aggregates up to 27.44" (697mm) of snow.Daylight
The month with the shortest days 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 4:52 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 5:02 pm EST.
Sunshine
In December, the average sunshine is 3.5h.UV index
December is the month with the lowest UV index in Grapeville, Pennsylvania, with an average maximum UV index of 1. 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: In December, the maximum UV index of 1 transforms into these recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Frequently asked questions
How cold is it in Grapeville in December?
What is the average humidity in December in Grapeville?
How many days does it rain in December in Grapeville?
How much does it snow in Grapeville in December?
What is the month with the shortest days in Grapeville?
What is the average length of the day in December in Grapeville?
When is the sunrise / sunset in December in Grapeville?
How many hours of sunshine does Grapeville have in December?
When is the lowest UV index in Grapeville?
How high is the UV index in December in Grapeville?
Average temperature in December
Grapeville, PA
- Average high temperature in December: 39°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.9°F).
- Average low temperature in December: 27.9°F
The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in December
Grapeville, PA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Grapeville, PA
- Average wind speed in December: 7.9mph
The windiest month (with the highest average wind speed) is January (8.5mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Grapeville, PA
- Average humidity in December: 84%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are April, July and August (77%).
Average rainfall in December
Grapeville, PA
- Average rainfall in December: 3.07"
The wettest month (with the highest rainfall) is May (3.74").
The driest month (with the least rainfall) is November (2.01").
Average rainfall days in December
Grapeville, PA
- Average rainfall days in December: 13.5 days
The month with the highest number of rainy days is May (20.9 days).
The month with the least rainy days is January (9.8 days).
Average snowfall in December
Grapeville, PA
- Average snowfall in December: 5.67"
The month with the highest snowfall is January (6.65").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Grapeville, PA
- Average snowfall days in December: 12.8 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
Grapeville, 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
Grapeville, PA
- Average sunshine days in December: 8.8 days
The month with the most sunshine days is November (13.5 days).
The month with the least sunshine days is January (6.4 days).
Average UV index in December
Grapeville, PA
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Grapeville, PA
- Average cloud cover in December: 65
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in December
Grapeville, 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).
Grapeville, Pennsylvania, USA
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