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 advent of December brings a subtle shift in temperature, with the average high moving from a cool 52.5°F (11.4°C) in November to a chilly 44.1°F (6.7°C). In Grottoes, the average temperature during the nights of December drops to a freezing cold 30°F (-1.1°C).Humidity
In Grottoes, the average relative humidity in December is 77%.Rainfall
In Grottoes, during December, the rain falls for 9.6 days and regularly aggregates up to 2.64" (67mm) of precipitation. Throughout the year, there are 164.3 rainfall days, and 30.08" (764mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Grottoes. In Grottoes, Virginia, during December, snow falls for 3.3 days and regularly aggregates up to 2.44" (62mm) of snow. In Grottoes, during the entire year, snow falls for 21.7 days and aggregates up to 16.69" (424mm) of snow.Daylight
With an average of 9h and 36min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:13 am and sunset at 4:55 pm. On the last day of December, in Grottoes, sunrise is at 7:31 am and sunset at 5:05 pm EST.
Sunshine
With an average of 5.3h of sunshine, December has the least sunshine of the year in Grottoes.UV index
The months with the lowest UV index in Grottoes are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Frequently asked questions
How cold does it get in Grottoes in December?
What is the average humidity in December in Grottoes?
How much does it rain in Grottoes in December?
How many days does it snow in December in Grottoes?
What is the month with the shortest days in Grottoes?
How many hours of daylight does Grottoes have in December?
What time are sunrise and sunset in December in Grottoes?
What is the month with the least sunshine in Grottoes?
How long on average sun shines in December in Grottoes?
What is the month with the lowest UV index in Grottoes?
What is the UV index intensity in December in Grottoes?
Average temperature in December
Grottoes, VA
- Average high temperature in December: 44.1°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (39°F).
- Average low temperature in December: 30°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in December
Grottoes, VA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in December
Grottoes, VA
- Average wind speed in December: 5.5mph
The windiest months (with the highest average wind speed) are February and April (6.6mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in December
Grottoes, VA
- Average humidity in December: 77%
The months with the highest relative humidity are May, September and October (78%).
The months with the lowest relative humidity are January, June and July (74%).
Average rainfall in December
Grottoes, VA
- Average rainfall in December: 2.64"
The wettest month (with the highest rainfall) is May (3.27").
The driest month (with the least rainfall) is January (1.89").
Average rainfall days in December
Grottoes, VA
- Average rainfall days in December: 9.6 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is November (8.6 days).
Average snowfall in December
Grottoes, VA
- Average snowfall in December: 2.44"
The month with the highest snowfall is March (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Grottoes, VA
- Average snowfall days in December: 3.3 days
The month with the highest number of snowfall days is February (6.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Grottoes, VA
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 5h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in December
Grottoes, VA
- Average sunshine days in December: 18.4 days
The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in December
Grottoes, VA
- 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
Grottoes, VA
- Average cloud cover in December: 43
The month with the most cloud cover is March (Cloud cover 46).
The months with the least cloud cover are June and July (Cloud cover 31).
Average visibility in December
Grottoes, VA
- Average visibility in December: 5mi
The months with the highest visibility are April, June, July, August and November (6mi).
The months with the lowest visibility are January, February, March, May, September, October and December (5mi).
Grottoes, Virginia, USA
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