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
December weather is marked by a drop in the average high-temperature, falling from a frosty 49.6°F (9.8°C) in November to a wintry 40.1°F (4.5°C). During the month of December, Long Valley experiences a steady low-temperature average of 28.6°F (-1.9°C).Humidity
The average relative humidity in December is 80%.Rainfall
In Long Valley, during December, the rain falls for 12 days and regularly aggregates up to 2.76" (70mm) of precipitation. In Long Valley, during the entire year, the rain falls for 161.9 days and collects up to 28.78" (731mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Long Valley, in December, snow falls for 5 days, with typically accumulated 2.09" (53mm) of snow. Throughout the year, there are 30.8 snowfall days, and 14.21" (361mm) 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 the month, sunrise is at 7:04 am and sunset at 4:32 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:41 pm EST.
Sunshine
In December, the average sunshine is 4.8h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 2 during December translates into the following guidance:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold during December?
What is the average humidity in December?
How many days does it rain in December in Long Valley?
How many days does it snow 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?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Long Valley, NJ
- Average high temperature in December: 40.1°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in December: 28.6°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in December
Long Valley, 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
Long Valley, NJ
- Average wind speed in December: 7.3mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Long Valley, NJ
- Average humidity in December: 80%
The months with the highest relative humidity are February and October (81%).
The month with the lowest relative humidity is April (75%).
Average rainfall in December
Long Valley, NJ
- Average rainfall in December: 2.76"
The wettest month (with the highest rainfall) is July (2.95").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in December
Long Valley, NJ
- Average rainfall days in December: 12 days
The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Long Valley, NJ
- Average snowfall in December: 2.09"
The month with the highest snowfall is February (3.78").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Long Valley, NJ
- Average snowfall days in December: 5 days
The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Long Valley, 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
Long Valley, NJ
- Average sunshine days in December: 16 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is June (11.5 days).
Average UV index in December
Long Valley, NJ
- Average UV index in December: 2
The months with the highest UV index are June and July (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
Long Valley, NJ
- Average cloud cover in December: 49
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in December
Long Valley, NJ
- Average visibility in December: 6mi
The months with the highest visibility are April, November and December (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September and October (5mi).
Long Valley, New Jersey, USA
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