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
Onset of December comes with a temperature decline, the average high falling from a cool 50.5°F (10.3°C) in November to a wintry 41°F (5°C). In Sir Johns Run, an average nighttime temperature of 29.1°F (-1.6°C) is expected during December.Humidity
February, October and December, with an average relative humidity of 79%, are the most humid months in Sir Johns Run.Rainfall
In Sir Johns Run, in December, during 10.6 rainfall days, 2.05" (52mm) of precipitation is typically accumulated. In Sir Johns Run, West Virginia, during the entire year, the rain falls for 158.9 days and collects up to 26.1" (663mm) of precipitation.Snowfall
January through April, November and December are months with snowfall in Sir Johns Run. In Sir Johns Run, West Virginia, in December, during 4.5 snowfall days, 1.85" (47mm) of snow is typically accumulated. In Sir Johns Run, West Virginia, during the entire year, snow falls for 25.1 days and aggregates up to 13.31" (338mm) of snow.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year in Sir Johns Run.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, in Sir Johns Run, sunrise is at 7:33 am and sunset at 4:59 pm EST.
Sunshine
In Sir Johns Run, West Virginia, the average sunshine in December is 5h.UV index
The months with the lowest UV index in Sir Johns Run are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: An average maximum UV index of 2 in December leads to these recommendations:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Frequently asked questions
How cold is it in Sir Johns Run in December?
What are the most humid months in Sir Johns Run?
What is the average humidity in December in Sir Johns Run?
How many days does it rain in December in Sir Johns Run?
How many days does it snow in December in Sir Johns Run?
What is the month with the shortest days in Sir Johns Run?
What is the average length of the day in December in Sir Johns Run?
When is the sunrise / sunset in December in Sir Johns Run?
How long on average sun shines in December in Sir Johns Run?
What are the months with the lowest UV index in Sir Johns Run?
What is the UV index reading in December in Sir Johns Run?
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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