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 coincides with a reduction in the average high-temperature, falling from a chilly 46.4°F (8°C) in November to an icy 36.9°F (2.7°C). Throughout the month of December, Harleigh witnesses an average temperature of 25.9°F (-3.4°C).Humidity
The average relative humidity in December is 83%.Rainfall
In Harleigh, in December, during 11 rainfall days, 2.83" (72mm) of precipitation is typically accumulated. In Harleigh, during the entire year, the rain falls for 163.3 days and collects up to 34.37" (873mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Harleigh, in December, during 10.7 snowfall days, 4.57" (116mm) of snow is typically accumulated. In Harleigh, during the entire year, snow falls for 53.8 days and aggregates up to 33.66" (855mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:09 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:45 pm EST.
Sunshine
In Harleigh, the average sunshine in December is 3.9h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 1 during December leads to these advisories:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December in Harleigh?
How many hours of sunshine does Harleigh have in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Harleigh, PA
- Average high temperature in December: 36.9°F
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in December: 25.9°F
The month with the highest average low temperature is July (59.9°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in December
Harleigh, PA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Harleigh, PA
- Average wind speed in December: 7.9mph
The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in December
Harleigh, PA
- Average humidity in December: 83%
The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is April (78%).
Average rainfall in December
Harleigh, PA
- Average rainfall in December: 2.83"
The wettest month (with the highest rainfall) is May (3.43").
The driest month (with the least rainfall) is September (2.01").
Average rainfall days in December
Harleigh, PA
- Average rainfall days in December: 11 days
The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is January (7.2 days).
Average snowfall in December
Harleigh, PA
- Average snowfall in December: 4.57"
The months with the highest snowfall are January and February (7.64").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Harleigh, PA
- Average snowfall days in December: 10.7 days
The month with the highest number of snowfall days is February (12.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Harleigh, PA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days in December
Harleigh, PA
- Average sunshine days in December: 12.8 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is May (8.7 days).
Average UV index in December
Harleigh, PA
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Harleigh, PA
- Average cloud cover in December: 60
The months with the most cloud cover are February and December (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 38).
Average visibility in December
Harleigh, PA
- Average visibility in December: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
Harleigh, Pennsylvania, USA
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