December weather forecastSaint Marys, WV
December
Weather in December
December, the first month of the winter in Saint Marys, is still a cold month, with temperature in the range of an average high of 41.9°F (5.5°C) and an average low of 30.6°F (-0.8°C).Temperature
A moderate decline in the average high-temperature is seen during December, decreasing from a cool 51.1°F (10.6°C) in November to a wintry 41.9°F (5.5°C). The month of December records an average low-temperature of 30.6°F (-0.8°C) in Saint Marys.Humidity
In Saint Marys, the average relative humidity in December is 82%.Rainfall
In December, in Saint Marys, the rain falls for 12.5 days. Throughout December, 3.11" (79mm) of precipitation is accumulated. Throughout the year, there are 177.1 rainfall days, and 33.39" (848mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall in Saint Marys. In Saint Marys, in December, snow falls for 10 days, with typically accumulated 2.95" (75mm) of snow. In Saint Marys, during the entire year, snow falls for 47.1 days and aggregates up to 17.99" (457mm) of snow.Daylight
The month with the shortest days in Saint Marys, West Virginia, is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:26 am and sunset at 5:01 pm. On the last day of December, in Saint Marys, sunrise is at 7:44 am and sunset at 5:11 pm EST.
Sunshine
In December, the average sunshine is 3.8h.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 value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: A maximum high daily UV index of 2 during December translates into the following directions:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. During bright days, sunglasses that offer UVA and UVB defense are recommended. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Saint Marys, WV
- Average high temperature in December: 41.9°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 (36.1°F).
- Average low temperature in December: 30.6°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).
Average pressure in December
Saint Marys, WV
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in December
Saint Marys, WV
- Average wind speed in December: 6.2mph
The windiest month (with the highest average wind speed) is February (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in December
Saint Marys, WV
- Average humidity in December: 82%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (76%).
Average rainfall in December
Saint Marys, WV
- Average rainfall in December: 3.11"
The wettest month (with the highest rainfall) is May (3.82").
The driest month (with the least rainfall) is September (2.05").
Average rainfall days in December
Saint Marys, WV
- Average rainfall days in December: 12.5 days
The month with the highest number of rainy days is May (20 days).
The month with the least rainy days is November (10.7 days).
Average snowfall in December
Saint Marys, WV
- Average snowfall in December: 2.95"
The month with the highest snowfall is February (4.84").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Saint Marys, WV
- Average snowfall days in December: 10 days
The month with the highest number of snowfall days is January (14 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Saint Marys, WV
- Average daylight in December: 9h and 24min
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: 3h and 48min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in December
Saint Marys, WV
- Average sunshine days in December: 11.4 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is May (8.5 days).
Average UV index in December
Saint Marys, WV
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Saint Marys, WV
- Average cloud cover in December: 61
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Saint Marys, WV
- Average visibility in December: 5mi
The months with the highest visibility are April and November (6mi).
The month with the lowest visibility is January (4mi).
