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
In Harrison, the average high-temperature in December decreases from a cool 50.9°F (10.5°C) in November to a wintry 41.9°F (5.5°C). Harrison records a negligible downturn from daytime temperatures, averaging a low of 32.9°F (0.5°C) in the month of December.Humidity
February and December, with an average relative humidity of 75%, are the most humid months.Rainfall
In December, in Harrison, New Jersey, the rain falls for 11.6 days. Throughout December, 2.95" (75mm) of precipitation is accumulated. Throughout the year, in Harrison, there are 150.3 rainfall days, and 27.72" (704mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall in Harrison. In Harrison, in December, snow falls for 2.5 days, with typically accumulated 1.5" (38mm) of snow. In Harrison, during the entire year, snow falls for 18.1 days and aggregates up to 8.46" (215mm) 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 7:02 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:39 pm EST.
Sunshine
In December, the average sunshine in Harrison is 4.9h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Harrison, New Jersey. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.Note: A maximum daily UV index of 2 during December morphs into the following directions:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Boost your sun resistance with garments that are densely woven yet spacious. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Frequently asked questions
Is it cold in Harrison during December?
What are the most humid months in Harrison?
What is the average humidity in December in Harrison?
How much does it rain in Harrison in December?
How many days does it snow in December in Harrison?
What is the month with the shortest days in Harrison?
How many hours of daylight does Harrison have in December?
When are sunrise and sunset in December in Harrison?
How long on average sun shines in December in Harrison?
When is the lowest UV index in Harrison?
What is the UV index intensity in December in Harrison?
Average temperature in December
Harrison, NJ
- Average high temperature in December: 41.9°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (36.3°F).
- Average low temperature in December: 32.9°F
The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).
Average pressure in December
Harrison, NJ
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Harrison, NJ
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in December
Harrison, NJ
- Average humidity in December: 75%
The months with the highest relative humidity are February and December (75%).
The month with the lowest relative humidity is August (70%).
Average rainfall in December
Harrison, NJ
- Average rainfall in December: 2.95"
The wettest month (with the highest rainfall) is July (3.23").
The driest months (with the least rainfall) are January and February (1.69").
Average rainfall days in December
Harrison, NJ
- Average rainfall days in December: 11.6 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in December
Harrison, NJ
- Average snowfall in December: 1.5"
The month with the highest snowfall is March (2.8").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Harrison, NJ
- Average snowfall days in December: 2.5 days
The months with the highest number of snowfall days are January and February (5.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Harrison, NJ
- Average daylight in December: 9h and 2min
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 18min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in December
Harrison, NJ
- Average sunshine days in December: 17.5 days
The month with the most sunshine days is January (19.6 days).
The month with the least sunshine days is July (12 days).
Average UV index in December
Harrison, 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
Harrison, NJ
- Average cloud cover in December: 47
The months with the most cloud cover are February, March and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Harrison, NJ
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Harrison, New Jersey, USA
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