December weather forecastRio, WV
December
Weather in December
The first month of the winter, December, is also an icy month in Rio, West Virginia, with an average temperature ranging between max 41.5°F (5.3°C) and min 29.1°F (-1.6°C).Temperature
December implies a gentle temperature shift, with average high-temperatures reducing from November's fresh 50.9°F (10.5°C) to an icy 41.5°F (5.3°C). Rio, during December, witnesses an average low-temperature of 29.1°F (-1.6°C).Humidity
In Rio, West Virginia, the average relative humidity in December is 78%.Rainfall
In Rio, in December, during 11.5 rainfall days, 2.2" (56mm) of precipitation is typically accumulated. In Rio, during the entire year, the rain falls for 166 days and collects up to 25.83" (656mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Rio, during December, snow falls for 5.9 days and regularly aggregates up to 2.24" (57mm) of snow. In Rio, during the entire year, snow falls for 31.2 days and aggregates up to 16.5" (419mm) of snow.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:15 am and sunset at 4:52 pm. On the last day of December, sunrise is at 7:33 am and sunset at 5:02 pm EST.
Sunshine
The months with the least sunshine in Rio are January and December, with an average of 5.1h of sunshine.UV index
The months with the lowest UV index in Rio are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.Note: A maximum daily UV index of 2 during December morphs into the following directions:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Boost your sun resistance with garments that are densely woven yet spacious. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Rio, WV
- Average high temperature in December: 41.5°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in December: 29.1°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 (22.5°F).
Average pressure in December
Rio, WV
- 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
Rio, WV
- Average wind speed in December: 6.2mph
The windiest month (with the highest average wind speed) is February (7.1mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in December
Rio, WV
- Average humidity in December: 78%
The month with the highest relative humidity is October (79%).
The months with the lowest relative humidity are April and July (74%).
Average rainfall in December
Rio, WV
- Average rainfall in December: 2.2"
The wettest month (with the highest rainfall) is May (3.11").
The driest months (with the least rainfall) are February and November (1.73").
Average rainfall days in December
Rio, WV
- Average rainfall days in December: 11.5 days
The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is November (9.1 days).
Average snowfall in December
Rio, WV
- Average snowfall in December: 2.24"
The month with the highest snowfall is March (4.21").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rio, WV
- Average snowfall days in December: 5.9 days
The month with the highest number of snowfall days is January (9.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rio, WV
- Average daylight in December: 9h and 30min
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 30min).
- Average sunshine in December: 5h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 6min).
Average sunshine days in December
Rio, WV
- Average sunshine days in December: 15.3 days
The month with the most sunshine days is November (18.3 days).
The month with the least sunshine days is May (10.1 days).
Average UV index in December
Rio, WV
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Rio, WV
- Average cloud cover in December: 46
The month with the most cloud cover is January (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
Rio, WV
- Average visibility in December: 6mi
The months with the highest visibility are April, June, July, November and December (6mi).
The months with the lowest visibility are January, February, March, May, August, September and October (5mi).
