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 average high-temperature recedes from November's cool 50.5°F (10.3°C) to a wintry 41°F (5°C). Sir Johns Run observes an average nighttime low-temperature of 29.1°F (-1.6°C) during the month of December.Humidity
February, October and December, with an average relative humidity of 79%, are the most humid months.Rainfall
In Sir Johns Run, in December, it is raining for 10.6 days, with typically 2.05" (52mm) of accumulated 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 Sir Johns Run, during December, snow falls for 4.5 days and regularly aggregates up to 1.85" (47mm) of snow. Throughout the year, in Sir Johns Run, 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 the month, sunrise is at 7:15 am and sunset at 4:49 pm. On the last day of December, sunrise is at 7:33 am and sunset at 4:59 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 of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 2 during December translates into the following guidance:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. 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
How cold is it in December?
What are the most humid months?
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?
How many hours of daylight does Sir Johns Run have in December?
When is the sunrise / sunset in December in Sir Johns Run?
How many hours of sunshine does Sir Johns Run have in December?
What are the months with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Sir Johns Run, WV
- 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
Sir Johns Run, 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
Sir Johns Run, WV
- 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
Sir Johns Run, WV
- 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
Sir Johns Run, WV
- 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
Sir Johns Run, WV
- 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
Sir Johns Run, WV
- 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
Sir Johns Run, WV
- 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
Sir Johns Run, WV
- 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
Sir Johns Run, WV
- 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
Sir Johns Run, WV
- 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
Sir Johns Run, WV
- 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
Sir Johns Run, WV
- 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).
Sir Johns Run, West Virginia, USA
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