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 decrease of average high-temperatures is mild in December, with a decline from a chilly 46.4°F (8°C) in November to an icy 36.9°F (2.7°C). Throughout the month of December, the average temperature in Harleigh, Pennsylvania, dips to a freezing cold 25.9°F (-3.4°C) at night.Humidity
The average relative humidity in December in Harleigh is 83%.Rainfall
In December, the rain falls for 11 days. Throughout December, 2.83" (72mm) of precipitation is accumulated. Throughout the year, there are 163.3 rainfall days, and 34.37" (873mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Harleigh, in December, during 10.7 snowfall days, 4.57" (116mm) of snow is typically accumulated. Throughout the year, in Harleigh, there are 53.8 snowfall days, and 33.66" (855mm) of snow is accumulated.Daylight
December has the shortest days of the year in Harleigh, Pennsylvania, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:09 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:28 am and sunset at 4:45 pm EST.
Sunshine
The average sunshine in December in Harleigh is 3.9h.UV index
The month with the lowest UV index in Harleigh is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index, 1 in December, converts into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Frequently asked questions
How cold is it in Harleigh in December?
What is the average humidity in December in Harleigh?
How much does it rain in Harleigh in December?
How many days does it snow in December in Harleigh?
What is the month with the shortest days in Harleigh?
What is the average length of the day in December in Harleigh?
When are sunrise and sunset in December in Harleigh?
How many hours of sunshine does Harleigh have in December?
When is the lowest UV index in Harleigh?
What is the UV index intensity in December in Harleigh?
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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