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 onset of December is marked by a minor decrease in temperature, transitioning from a fresh 53.2°F (11.8°C) in November to a frosty 44.4°F (6.9°C). December brings Portersville a consistent average low-temperature of 32.7°F (0.4°C).Humidity
In December, the average relative humidity is 80%.Rainfall
In Portersville, during December, the rain falls for 13.5 days and regularly aggregates up to 3.15" (80mm) of precipitation. Throughout the year, there are 176 rainfall days, and 33.15" (842mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In Portersville, in December, during 7.5 snowfall days, 2.99" (76mm) of snow is typically accumulated. Throughout the year, in Portersville, West Virginia, there are 38.2 snowfall days, and 14.92" (379mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of December, sunrise is at 7:27 am and sunset at 5:08 pm. On the last day of the month, sunrise is at 7:45 am and sunset at 5:18 pm EST.
Sunshine
The average sunshine in December is 4.2h.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 reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, a regular UV index of 2 translates into these guidelines:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. It's recommended to limit sun exposure when its radiation is at its peak during midday. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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
How cold does it get in December?
What is the average humidity in December in Portersville?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days in Portersville?
What is the average length of the day in December?
When are sunrise and sunset in December?
How long on average sun shines in December?
What are the months with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Portersville, WV
- Average high temperature in December: 44.4°F
The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (39°F).
- Average low temperature in December: 32.7°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in December
Portersville, WV
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in December
Portersville, WV
- Average wind speed in December: 6.2mph
The windiest month (with the highest average wind speed) is February (6.7mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in December
Portersville, WV
- Average humidity in December: 80%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is August (74%).
Average rainfall in December
Portersville, WV
- Average rainfall in December: 3.15"
The wettest month (with the highest rainfall) is May (3.54").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in December
Portersville, WV
- Average rainfall days in December: 13.5 days
The month with the highest number of rainy days is May (19.6 days).
The month with the least rainy days is November (10.9 days).
Average snowfall in December
Portersville, WV
- Average snowfall in December: 2.99"
The month with the highest snowfall is January (3.62").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Portersville, WV
- Average snowfall days in December: 7.5 days
The month with the highest number of snowfall days is January (11.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Portersville, WV
- Average daylight in December: 9h and 3min
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 30min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Portersville, WV
- Average sunshine days in December: 12.8 days
The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is February (9.3 days).
Average UV index in December
Portersville, WV
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in December
Portersville, WV
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in December
Portersville, WV
- Average visibility in December: 5mi
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
Portersville, West Virginia, USA
Weather forecast for your location
2. Allow the app to use your location