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
December's onset brings a reduction in the average high-temperature, from a cool 50°F (10°C) in November to a cold 41°F (5°C). During December, Mechanicsburg observes a consistent average nighttime temperature of 29.7°F (-1.3°C).Humidity
In Mechanicsburg, the average relative humidity in December is 79%.Rainfall
In Mechanicsburg, in December, it is raining for 8.4 days, with typically 0.87" (22mm) of accumulated precipitation. Throughout the year, in Mechanicsburg, there are 122.3 rainfall days, and 11.73" (298mm) of precipitation is accumulated.Snowfall
Months with snowfall in Mechanicsburg, Pennsylvania, are January through April, November and December. In Mechanicsburg, in December, during 3.5 snowfall days, 0.59" (15mm) of snow is typically accumulated. In Mechanicsburg, during the entire year, snow falls for 19.9 days and aggregates up to 4.29" (109mm) of snow.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 7:11 am and sunset at 4:42 pm. On the last day of December, sunrise is at 7:30 am and sunset at 4:52 pm EST.
Sunshine
In Mechanicsburg, the average sunshine in December is 4.7h.UV index
The months with the lowest UV index in Mechanicsburg are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Frequently asked questions
How cold is it in Mechanicsburg in December?
What is the average humidity in December in Mechanicsburg?
How much does it rain in Mechanicsburg in December?
How much does it snow in Mechanicsburg in December?
What is the month with the shortest days in Mechanicsburg?
What is the average length of the day in December in Mechanicsburg?
When are sunrise and sunset in December in Mechanicsburg?
How many hours of sunshine does Mechanicsburg have in December?
When is the lowest UV index in Mechanicsburg?
What is the UV index intensity in December in Mechanicsburg?
Average temperature in December
Mechanicsburg, PA
- Average high temperature in December: 41°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (35.1°F).
- Average low temperature in December: 29.7°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).
Average pressure in December
Mechanicsburg, 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 (29.95"Hg).
Average wind speed in December
Mechanicsburg, PA
- Average wind speed in December: 7.6mph
The windiest month (with the highest average wind speed) is March (8.2mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).
Average humidity in December
Mechanicsburg, PA
- Average humidity in December: 79%
The month with the highest relative humidity is February (80%).
The months with the lowest relative humidity are March and April (75%).
Average rainfall in December
Mechanicsburg, PA
- Average rainfall in December: 0.87"
The wettest month (with the highest rainfall) is August (1.3").
The driest months (with the least rainfall) are January and February (0.71").
Average rainfall days in December
Mechanicsburg, PA
- Average rainfall days in December: 8.4 days
The month with the highest number of rainy days is May (13.9 days).
The month with the least rainy days is January (5.7 days).
Average snowfall in December
Mechanicsburg, PA
- Average snowfall in December: 0.59"
The month with the highest snowfall is February (1.3").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Mechanicsburg, PA
- Average snowfall days in December: 3.5 days
The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Mechanicsburg, 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 4min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
Mechanicsburg, PA
- Average sunshine days in December: 20.2 days
The month with the most sunshine days is November (21.8 days).
The month with the least sunshine days is July (14.1 days).
Average UV index in December
Mechanicsburg, PA
- 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, March, November and December (UV index 2).
Average cloud cover in December
Mechanicsburg, PA
- Average cloud cover in December: 50
The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Mechanicsburg, PA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Mechanicsburg, Pennsylvania, USA
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