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
December involves a decrease in temperature, down from a fresh 50.5°F (10.3°C) in November to a wintry 41°F (5°C). In December, Shady Grove experiences a temperature dip to an average of 29.1°F (-1.6°C) at night.Humidity
The months with the highest humidity are February, October and December, with an average relative humidity of 79%.Rainfall
In Shady Grove, during December, the rain falls for 10.6 days and regularly aggregates up to 2.05" (52mm) of precipitation. Throughout the year, there are 158.9 rainfall days, and 26.1" (663mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In December, it is snowing for 4.5 days. Throughout December, 1.85" (47mm) of snow is accumulated. Throughout the year, there are 25.1 snowfall days, and 13.31" (338mm) of snow is accumulated.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 7:13 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:56 pm EST.
Sunshine
The average sunshine in December is 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 reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: A daily maximum UV index of 2 in December translates into the following instructions:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What are the most humid months?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
How long on average sun shines in December?
What are the months with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Shady Grove, PA
- Average high temperature in December: 41°F
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (36°F).
- Average low temperature in December: 29.1°F
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in December
Shady Grove, 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
Shady Grove, PA
- Average wind speed in December: 6.5mph
The windiest months (with the highest average wind speed) are January and February (7.2mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).
Average humidity in December
Shady Grove, PA
- Average humidity in December: 79%
The months with the highest relative humidity are February, October and December (79%).
The months with the lowest relative humidity are April and July (74%).
Average rainfall in December
Shady Grove, PA
- Average rainfall in December: 2.05"
The wettest month (with the highest rainfall) is May (3.03").
The driest month (with the least rainfall) is November (1.69").
Average rainfall days in December
Shady Grove, PA
- Average rainfall days in December: 10.6 days
The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is November (9.3 days).
Average snowfall in December
Shady Grove, PA
- Average snowfall in December: 1.85"
The month with the highest snowfall is February (3.9").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Shady Grove, PA
- Average snowfall days in December: 4.5 days
The month with the highest number of snowfall days is January (7.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Shady Grove, PA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in December
Shady Grove, PA
- Average sunshine days in December: 16.6 days
The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in December
Shady Grove, 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, November and December (UV index 2).
Average cloud cover in December
Shady Grove, PA
- Average cloud cover in December: 48
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
Shady Grove, PA
- Average visibility in December: 5mi
The months with the highest visibility are February, March, April, June, July and November (6mi).
The months with the lowest visibility are January, May, August, September, October and December (5mi).
Shady Grove, Pennsylvania, USA
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