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 start of December comes with a reduction in the average high-temperature, receding from a cool 51.1°F (10.6°C) in November to a cold 41.9°F (5.5°C). During the month of December, Mountville's nighttime temperature lowers to an average of 30°F (-1.1°C).Humidity
In December, the average relative humidity is 79%.Rainfall
In Mountville, in December, during 8.2 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. Throughout the year, there are 125.9 rainfall days, and 15.08" (383mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Mountville, Pennsylvania, in December, during 2.6 snowfall days, 0.79" (20mm) of snow is typically accumulated. Throughout the year, there are 16.4 snowfall days, and 5.04" (128mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:09 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:50 pm EST.
Sunshine
In December, the average sunshine is 4.8h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index of 2 during December leads to these instructions:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in Mountville in December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Mountville have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Mountville, PA
- Average high temperature in December: 41.9°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (35.4°F).
- Average low temperature in December: 30°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (22.8°F).
Average pressure in December
Mountville, PA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Mountville, PA
- Average wind speed in December: 8.3mph
The windiest months (with the highest average wind speed) are February and March (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in December
Mountville, PA
- Average humidity in December: 79%
The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
Mountville, PA
- Average rainfall in December: 1.1"
The wettest month (with the highest rainfall) is August (2.09").
The driest month (with the least rainfall) is February (0.83").
Average rainfall days in December
Mountville, PA
- Average rainfall days in December: 8.2 days
The month with the highest number of rainy days is July (14.9 days).
The month with the least rainy days is February (5.7 days).
Average snowfall in December
Mountville, PA
- Average snowfall in December: 0.79"
The month with the highest snowfall is March (1.46").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mountville, PA
- Average snowfall days in December: 2.6 days
The month with the highest number of snowfall days is February (4.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mountville, PA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
Mountville, PA
- Average sunshine days in December: 19.9 days
The month with the most sunshine days is November (21.4 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in December
Mountville, PA
- 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, November and December (UV index 2).
Average cloud cover in December
Mountville, PA
- Average cloud cover in December: 49
The months with the most cloud cover are February, March and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in December
Mountville, PA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, October, November and December (6mi).
The months with the lowest visibility are May, August and September (5mi).
Mountville, Pennsylvania, USA
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