December weather forecastGreendell, NJ
December
Weather in December
The first month of the winter, December, is still a cold month in Greendell, New Jersey, with an average temperature ranging between min 27.3°F (-2.6°C) and max 38.7°F (3.7°C).Temperature
In the transition to December, Greendell observes a drop in the average high-temperature, moving from a frosty 48.4°F (9.1°C) in November to a wintry 38.7°F (3.7°C). During the month of December, Greendell anticipates a mean low-temperature of 27.3°F (-2.6°C).Humidity
February and December, with an average relative humidity of 82%, are the most humid months.Rainfall
In Greendell, in December, it is raining for 11.5 days, with typically 2.68" (68mm) of accumulated precipitation. Throughout the year, there are 161.1 rainfall days, and 28.98" (736mm) of precipitation is accumulated.Snowfall
Months with snowfall in Greendell are January through May, October through December. In Greendell, in December, during 6.5 snowfall days, 2.83" (72mm) of snow is typically accumulated. Throughout the year, there are 36.8 snowfall days, and 17.52" (445mm) of snow is accumulated.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 7:05 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:41 pm EST.
Sunshine
In Greendell, the average sunshine in December is 4.6h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: A maximum UV index of 1 in December translates into the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Experience reduced UV exposure by about half when donning a wide-brim hat. 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
Average temperature in December
Greendell, NJ
- Average high temperature in December: 38.7°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (33.3°F).
- Average low temperature in December: 27.3°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in December
Greendell, NJ
- Average pressure in December: 30.08"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
Greendell, NJ
- Average wind speed in December: 7.1mph
The windiest month (with the highest average wind speed) is March (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in December
Greendell, NJ
- Average humidity in December: 82%
The months with the highest relative humidity are February and December (82%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
Greendell, NJ
- Average rainfall in December: 2.68"
The wettest month (with the highest rainfall) is July (3.03").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in December
Greendell, NJ
- Average rainfall days in December: 11.5 days
The months with the highest number of rainy days are May and July (17.3 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in December
Greendell, NJ
- Average snowfall in December: 2.83"
The months with the highest snowfall are January and February (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Greendell, NJ
- Average snowfall days in December: 6.5 days
The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Greendell, NJ
- Average daylight in December: 9h and 18min
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: 4h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).
Average sunshine days in December
Greendell, NJ
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is June (11.3 days).
Average UV index in December
Greendell, NJ
- Average UV index in December: 1
The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Greendell, NJ
- Average cloud cover in December: 51
The month with the most cloud cover is February (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 37).
Average visibility in December
Greendell, NJ
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
