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 is marked by a subtle drop in average high-temperatures, transitioning from a cool 50.9°F (10.5°C) in November to a cold 42.1°F (5.6°C). Throughout the month of December, the average temperature in McSherrystown, Pennsylvania, dips to a freezing cold 29.8°F (-1.2°C) at night.Humidity
In McSherrystown, Pennsylvania, the average relative humidity in December is 79%.Rainfall
In McSherrystown, Pennsylvania, in December, it is raining for 8.3 days, with typically 1.22" (31mm) of accumulated precipitation. Throughout the year, there are 133.6 rainfall days, and 17.52" (445mm) of precipitation is accumulated.Snowfall
Months with snowfall in McSherrystown are January through April, October through December. In McSherrystown, during December, snow falls for 3.7 days and regularly aggregates up to 1.18" (30mm) of snow. Throughout the year, there are 19.9 snowfall days, and 7.24" (184mm) 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 the month, sunrise is at 7:10 am and sunset at 4:43 pm. On the last day of December, in McSherrystown, sunrise is at 7:29 am and sunset at 4:53 pm EST.
Sunshine
The average sunshine in December in McSherrystown is 4.9h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in McSherrystown. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.Note: An average UV index of 2 in December transforms into this advice:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Frequently asked questions
How cold is it in McSherrystown in December?
What is the average humidity in December in McSherrystown?
How many days does it rain in December in McSherrystown?
How many days does it snow in December in McSherrystown?
What is the month with the shortest days in McSherrystown?
How many hours of daylight does McSherrystown have in December?
When are sunrise and sunset in December in McSherrystown?
How many hours of sunshine does McSherrystown have in December?
What are the months with the lowest UV index in McSherrystown?
What is the UV index intensity in December in McSherrystown?
Average temperature in December
McSherrystown, PA
- Average high temperature in December: 42.1°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 (36.1°F).
- Average low temperature in December: 29.8°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).
Average pressure in December
McSherrystown, PA
- 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
McSherrystown, PA
- Average wind speed in December: 8mph
The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).
Average humidity in December
McSherrystown, PA
- Average humidity in December: 79%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is April (75%).
Average rainfall in December
McSherrystown, PA
- Average rainfall in December: 1.22"
The wettest months (with the highest rainfall) are July and August (2.01").
The driest month (with the least rainfall) is January (1.06").
Average rainfall days in December
McSherrystown, PA
- Average rainfall days in December: 8.3 days
The month with the highest number of rainy days is May (15.9 days).
The month with the least rainy days is January (5.6 days).
Average snowfall in December
McSherrystown, PA
- Average snowfall in December: 1.18"
The month with the highest snowfall is January (2.17").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
McSherrystown, PA
- Average snowfall days in December: 3.7 days
The month with the highest number of snowfall days is January (6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
McSherrystown, PA
- 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: 4h and 5min
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 36min).
Average sunshine days in December
McSherrystown, PA
- Average sunshine days in December: 19.9 days
The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is May (13.1 days).
Average UV index in December
McSherrystown, PA
- 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, March, November and December (UV index 2).
Average cloud cover in December
McSherrystown, PA
- Average cloud cover in December: 47
The months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
McSherrystown, 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).
McSherrystown, Pennsylvania, USA
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