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
The arrival of December signals a shift in temperature, down from a cool 52°F (11.1°C) in November to a frosty 43°F (6.1°C). The average nighttime temperature lowers to a subzero cold 31.5°F (-0.3°C) throughout December.Humidity
The months with the highest humidity are February, May, September, October and December, with an average relative humidity of 79%.Rainfall
In West Grove, in December, during 8.5 rainfall days, 1.22" (31mm) of precipitation is typically accumulated. Throughout the year, there are 126.3 rainfall days, and 14.25" (362mm) of precipitation is accumulated.Snowfall
January through May, November and December are months with snowfall. In West Grove, during December, snow falls for 2.1 days and regularly aggregates up to 0.59" (15mm) of snow. Throughout the year, in West Grove, there are 15.4 snowfall days, and 4.33" (110mm) 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 7:06 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:48 pm EST.
Sunshine
In December, the average sunshine is 5h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for average individuals.Note: During December, 2 as the daily maximum UV index converts into the following advice:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Boost your sun resistance with garments that are densely woven yet spacious. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in December?
What is the most humid month?
What is the average humidity in December?
How much 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 is the sunrise / sunset in December?
How many hours of sunshine does West Grove have in December?
When is the lowest UV index?
What is the UV index reading in December in West Grove?
Average temperature in December
West Grove, PA
- Average high temperature in December: 43°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (36.9°F).
- Average low temperature in December: 31.5°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).
Average pressure in December
West Grove, PA
- Average pressure in December: 30.1"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
West Grove, PA
- Average wind speed in December: 8.2mph
The windiest months (with the highest average wind speed) are February and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
West Grove, PA
- Average humidity in December: 79%
The months with the highest relative humidity are February, May, September, October and December (79%).
The months with the lowest relative humidity are March and April (75%).
Average rainfall in December
West Grove, PA
- Average rainfall in December: 1.22"
The wettest month (with the highest rainfall) is August (1.93").
The driest months (with the least rainfall) are January, September and November (0.87").
Average rainfall days in December
West Grove, PA
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is July (14.9 days).
The month with the least rainy days is January (5.9 days).
Average snowfall in December
West Grove, PA
- Average snowfall in December: 0.59"
The month with the highest snowfall is March (1.26").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
West Grove, PA
- Average snowfall days in December: 2.1 days
The month with the highest number of snowfall days is January (5.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
West 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 February (Average sunshine: 4h and 48min).
Average sunshine days in December
West Grove, PA
- Average sunshine days in December: 19.9 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is July (12.9 days).
Average UV index in December
West Grove, PA
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
West Grove, PA
- Average cloud cover in December: 46
The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
West Grove, PA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
West Grove, Pennsylvania, USA
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