December weather forecastHarneys Corner, NJ
December
Weather in December
December, the first month of the winter in Harneys Corner, is still a chilly month, with an average temperature fluctuating between 43.2°F (6.2°C) and 32°F (0°C).Temperature
The start of December comes with a small reduction in the average high-temperature, subtly receding from a fresh 52°F (11.1°C) in November to a frosty 43.2°F (6.2°C). Harneys Corner records a mean low-temperature of 32°F (0°C) in December.Humidity
In Harneys Corner, the average relative humidity in December is 77%.Rainfall
In Harneys Corner, New Jersey, in December, during 11.2 rainfall days, 3.15" (80mm) of precipitation is typically accumulated. In Harneys Corner, during the entire year, the rain falls for 156.8 days and collects up to 31.81" (808mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Harneys Corner, in December, during 3 snowfall days, 1.3" (33mm) of snow is typically accumulated. In Harneys Corner, during the entire year, snow falls for 16.6 days and aggregates up to 8.86" (225mm) 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 7:02 am and sunset at 4:33 pm. On the last day of December, in Harneys Corner, New Jersey, sunrise is at 7:21 am and sunset at 4:43 pm EST.
Sunshine
The average sunshine in December is 5h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Harneys Corner. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 2 during December translates into the following recommendations:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Harneys Corner, NJ
- Average high temperature in December: 43.2°F
The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is January (36.9°F).
- Average low temperature in December: 32°F
The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure in December
Harneys Corner, NJ
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Harneys Corner, NJ
- Average wind speed in December: 7.7mph
The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity in December
Harneys Corner, NJ
- Average humidity in December: 77%
The months with the highest relative humidity are February and October (78%).
The month with the lowest relative humidity is April (72%).
Average rainfall in December
Harneys Corner, NJ
- Average rainfall in December: 3.15"
The wettest month (with the highest rainfall) is July (3.74").
The driest month (with the least rainfall) is January (1.85").
Average rainfall days in December
Harneys Corner, NJ
- Average rainfall days in December: 11.2 days
The month with the highest number of rainy days is July (18.5 days).
The month with the least rainy days is January (7.9 days).
Average snowfall in December
Harneys Corner, NJ
- Average snowfall in December: 1.3"
The month with the highest snowfall is March (2.72").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Harneys Corner, NJ
- Average snowfall days in December: 3 days
The month with the highest number of snowfall days is January (4.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Harneys Corner, NJ
- Average daylight in December: 9h and 24min
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: 5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in December
Harneys Corner, NJ
- Average sunshine days in December: 18.1 days
The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is July (9.3 days).
Average UV index in December
Harneys Corner, NJ
- 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
Harneys Corner, NJ
- Average cloud cover in December: 47
The months with the most cloud cover are February, March and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility in December
Harneys Corner, NJ
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
