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 arrival of December corresponds with a shift in temperature, down from a fresh 50.5°F (10.3°C) in November to a cold 40.8°F (4.9°C). Nightly temperatures drop to an average low of 29.5°F (-1.4°C) in December.Humidity
The months with the highest humidity in East Hanover are February, October and December, with an average relative humidity of 80%.Rainfall
In East Hanover, during December, the rain falls for 10.9 days and regularly aggregates up to 2.4" (61mm) of precipitation. Throughout the year, there are 157.9 rainfall days, and 27.05" (687mm) of precipitation is accumulated.Snowfall
January through May, November and December are months with snowfall in East Hanover. In East Hanover, during December, snow falls for 3.8 days and regularly aggregates up to 1.06" (27mm) of snow. Throughout the year, there are 24 snowfall days, and 9.72" (247mm) of snow is accumulated.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:03 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:39 pm EST.
Sunshine
The average sunshine in December is 4.8h.UV index
The months with the lowest UV index in East Hanover are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: In December, the maximum UV index of 2 transforms into these recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What are the most humid months?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in East Hanover 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?
How long on average sun shines in December?
What is the month with the lowest UV index?
How high is the UV index in December?
Average temperature in December
East Hanover, NJ
- Average high temperature in December: 40.8°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (34.9°F).
- Average low temperature in December: 29.5°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in December
East Hanover, 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
East Hanover, NJ
- Average wind speed in December: 7.6mph
The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
East Hanover, NJ
- Average humidity in December: 80%
The months with the highest relative humidity are February, October and December (80%).
The month with the lowest relative humidity is April (74%).
Average rainfall in December
East Hanover, NJ
- Average rainfall in December: 2.4"
The wettest month (with the highest rainfall) is July (3.19").
The driest months (with the least rainfall) are January, February and September (1.57").
Average rainfall days in December
East Hanover, NJ
- Average rainfall days in December: 10.9 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
East Hanover, NJ
- Average snowfall in December: 1.06"
The month with the highest snowfall is March (3.7").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
East Hanover, NJ
- Average snowfall days in December: 3.8 days
The month with the highest number of snowfall days is February (6.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
East Hanover, NJ
- 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: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
East Hanover, NJ
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is November (19 days).
The month with the least sunshine days is July (10.9 days).
Average UV index in December
East Hanover, NJ
- Average UV index in December: 2
The months with the highest UV index are 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
East Hanover, NJ
- Average cloud cover in December: 49
The months with the most cloud cover are February, March and December (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 34).
Average visibility in December
East Hanover, NJ
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, July, August, October, November and December (6mi).
The months with the lowest visibility are May, June and September (5mi).
East Hanover, New Jersey, USA
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