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
With December's onset, the weather reveals a slight temperature decrease, transitioning from a moderate 57.6°F (14.2°C) in November to a frosty 49.8°F (9.9°C). The average temperature during December nights dips to a cold 35.6°F (2°C).Humidity
December is the most humid month, with an average relative humidity of 77%.Rainfall
In Alton, in December, during 10.5 rainfall days, 2.76" (70mm) of precipitation is typically accumulated. In Alton, during the entire year, the rain falls for 157.9 days and collects up to 29.57" (751mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In December, in Alton, it is snowing for 1.1 days. Throughout December, 1.97" (50mm) of snow is accumulated. Throughout the year, there are 9.2 snowfall days, and 7.64" (194mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 42min of daylight.On the first day of the month, sunrise is at 7:10 am and sunset at 5:00 pm. On the last day of December, sunrise is at 7:27 am and sunset at 5:10 pm EST.
Sunshine
With an average of 5.4h of sunshine, December has the least sunshine of the year in Alton, Virginia.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index of 2 during December leads to these instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are December temperatures in Alton?
What is the most humid month in Alton?
What is the average humidity in December in Alton?
How many days does it rain in December in Alton?
How much does it snow in Alton in December?
What is the month with the shortest days in Alton?
What is the average length of the day in December in Alton?
What time are sunrise and sunset in December in Alton?
What is the month with the least sunshine in Alton?
How many hours of sunshine does Alton have in December?
What is the month with the lowest UV index in Alton?
How high is the UV index in December in Alton?
Average temperature in December
Alton, VA
- Average high temperature in December: 49.8°F
The warmest month (with the highest average high temperature) is July (90.3°F).
The month with the lowest average high temperature is January (45.5°F).
- Average low temperature in December: 35.6°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (30.4°F).
Average pressure in December
Alton, VA
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in December
Alton, VA
- Average wind speed in December: 6.1mph
The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in December
Alton, VA
- Average humidity in December: 77%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is July (69%).
Average rainfall in December
Alton, VA
- Average rainfall in December: 2.76"
The wettest month (with the highest rainfall) is May (2.95").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in December
Alton, VA
- Average rainfall days in December: 10.5 days
The months with the highest number of rainy days are May and July (17.3 days).
The month with the least rainy days is November (9.2 days).
Average snowfall in December
Alton, VA
- Average snowfall in December: 1.97"
The month with the highest snowfall is January (2.48").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Alton, VA
- Average snowfall days in December: 1.1 days
The months with the highest number of snowfall days are January and February (3.1 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
Alton, VA
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 5h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in December
Alton, VA
- Average sunshine days in December: 18.6 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in December
Alton, VA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in December
Alton, VA
- Average cloud cover in December: 41
The month with the most cloud cover is March (Cloud cover 43).
The months with the least cloud cover are June and July (Cloud cover 31).
Average visibility in December
Alton, VA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Alton, Virginia, USA
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