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
With December's arrival, Mahwah, New Jersey, sees a decrease in average high-temperatures, moving from a cool 50°F (10°C) in November to an icy 40.1°F (4.5°C). December witnesses an average nighttime temperature of 29.1°F (-1.6°C) in Mahwah, New Jersey.Humidity
The months with the highest humidity are February and December, with an average relative humidity of 79%.Rainfall
December is the month with the most rainfall in Mahwah. Rain falls for 10.8 days and accumulates 2.68" (68mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Mahwah, New Jersey. In Mahwah, during December, snow falls for 5.1 days and regularly aggregates up to 1.81" (46mm) of snow. In Mahwah, New Jersey, during the entire year, snow falls for 28.5 days and aggregates up to 10.98" (279mm) of snow.Daylight
December has the shortest days of the year in Mahwah, with an average of 9h and 18min of daylight.On the first day of December in Mahwah, sunrise is at 7:02 am and sunset at 4:28 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:38 pm EST.
Sunshine
In Mahwah, the average sunshine in December 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 estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index of 2 during December leads to these instructions:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. Avoiding the Sun during its peak radiation time around midday is a healthy practice. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Frequently asked questions
How cold is December in Mahwah?
What are the most humid months in Mahwah?
What is the average humidity in December in Mahwah?
What is the rainiest month in Mahwah?
How many days does it rain in December in Mahwah?
How much does it snow in Mahwah in December?
What is the month with the shortest days in Mahwah?
How many hours of daylight does Mahwah have in December?
When is the sunrise / sunset in December in Mahwah?
How long on average sun shines in December in Mahwah?
When is the lowest UV index in Mahwah?
How high is the UV index in December in Mahwah?
Average temperature in December
Mahwah, NJ
- Average high temperature in December: 40.1°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (34.3°F).
- Average low temperature in December: 29.1°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).
Average pressure in December
Mahwah, 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
Mahwah, NJ
- Average wind speed in December: 7.1mph
The windiest month (with the highest average wind speed) is March (7.7mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Mahwah, NJ
- Average humidity in December: 79%
The months with the highest relative humidity are February and December (79%).
The month with the lowest relative humidity is April (72%).
Average rainfall in December
Mahwah, NJ
- Average rainfall in December: 2.68"
The wettest month (with the highest rainfall) is December (2.68").
The driest month (with the least rainfall) is September (1.34").
Average rainfall days in December
Mahwah, NJ
- Average rainfall days in December: 10.8 days
The month with the highest number of rainy days is July (16.6 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in December
Mahwah, NJ
- Average snowfall in December: 1.81"
The month with the highest snowfall is February (2.91").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mahwah, NJ
- Average snowfall days in December: 5.1 days
The month with the highest number of snowfall days is February (7.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mahwah, 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 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
Mahwah, NJ
- Average sunshine days in December: 15.7 days
The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is June (11.8 days).
Average UV index in December
Mahwah, 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
Mahwah, NJ
- Average cloud cover in December: 48
The months with the most cloud cover are February and March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in December
Mahwah, NJ
- Average visibility in December: 6mi
The months with the highest visibility are January, March, April, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are February and May (5mi).
Mahwah, New Jersey, USA
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