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 Mountain Lakes, the average high-temperature in December drops from a frosty 49.8°F (9.9°C) in November to an icy 40.1°F (4.5°C). December is noted for a mean low-temperature of 29.1°F (-1.6°C).Humidity
February, October and December, with an average relative humidity of 80%, are the most humid months.Rainfall
December is the month with the most rainfall. Rain falls for 11.2 days and accumulates 3.43" (87mm) of precipitation.Snowfall
Months with snowfall in Mountain Lakes are January through May, October through December. In Mountain Lakes, during December, snow falls for 4.7 days and regularly aggregates up to 2.24" (57mm) of snow. Throughout the year, there are 30.9 snowfall days, and 15.79" (401mm) 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 7:22 am and sunset at 4:39 pm EST.
Sunshine
In Mountain Lakes, the average sunshine in December is 4.8h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily maximum UV index of 2 in December translates into the following instructions:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Mountain Lakes?
What is the most humid month in Mountain Lakes?
What is the average humidity in December in Mountain Lakes?
What is the wettest month in Mountain Lakes?
How much does it rain in Mountain Lakes in December?
How many days does it snow in December in Mountain Lakes?
What is the month with the shortest days in Mountain Lakes?
How many hours of daylight does Mountain Lakes have in December?
What time are sunrise and sunset in December in Mountain Lakes?
How long on average sun shines in December in Mountain Lakes?
When is the lowest UV index in Mountain Lakes?
What is the UV index reading in December in Mountain Lakes?
Average temperature in December
Mountain Lakes, 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 (34.5°F).
- Average low temperature in December: 29.1°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in December
Mountain Lakes, 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
Mountain Lakes, NJ
- Average wind speed in December: 7.5mph
The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Mountain Lakes, 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
Mountain Lakes, NJ
- Average rainfall in December: 3.43"
The wettest month (with the highest rainfall) is December (3.43").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in December
Mountain Lakes, NJ
- Average rainfall days in December: 11.2 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (8.2 days).
Average snowfall in December
Mountain Lakes, NJ
- Average snowfall in December: 2.24"
The month with the highest snowfall is March (4.69").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mountain Lakes, NJ
- Average snowfall days in December: 4.7 days
The month with the highest number of snowfall days is February (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mountain Lakes, 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 12min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in December
Mountain Lakes, NJ
- Average sunshine days in December: 16.1 days
The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is April (11.2 days).
Average UV index in December
Mountain Lakes, 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
Mountain Lakes, NJ
- Average cloud cover in December: 50
The months with the most cloud cover are February, March and December (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 35).
Average visibility in December
Mountain Lakes, NJ
- Average visibility in December: 6mi
The months with the highest visibility are January, April, July, August, October, November and December (6mi).
The months with the lowest visibility are February, March, May, June and September (5mi).
Mountain Lakes, New Jersey, USA
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