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
As December arrives, Glen Rock's weather displays a decrease in high-temperatures, transitioning from November's fresh 50.9°F (10.5°C) to a cold 41.2°F (5.1°C). In December, Glen Rock records an average nighttime temperature of 30.9°F (-0.6°C).Humidity
The months with the highest humidity are February and December, with an average relative humidity of 78%.Rainfall
The wettest months are July and December, with an average 3.07" (78mm) of rainfall.Snowfall
January through May, October through December are months with snowfall. In December, in Glen Rock, New Jersey, it is snowing for 4 days. Throughout December, 1.54" (39mm) of snow is accumulated. In Glen Rock, during the entire year, snow falls for 24.9 days and aggregates up to 10.04" (255mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:02 am and sunset at 4:29 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:38 pm EST.
Sunshine
In December, the average sunshine in Glen Rock 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 in Glen Rock, New Jersey. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 2 in December converts into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Frequently asked questions
Is December cold in Glen Rock?
What is the most humid month in Glen Rock?
What is the average humidity in December in Glen Rock?
What is the rainiest month in Glen Rock?
How many days does it rain in December in Glen Rock?
How many days does it snow in December in Glen Rock?
What is the month with the shortest days in Glen Rock?
What is the average length of the day in December in Glen Rock?
When are sunrise and sunset in December in Glen Rock?
How long on average sun shines in December in Glen Rock?
What are the months with the lowest UV index in Glen Rock?
What is the UV index reading in December in Glen Rock?
Average temperature in December
Glen Rock, NJ
- Average high temperature in December: 41.2°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (35.2°F).
- Average low temperature in December: 30.9°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in December
Glen Rock, NJ
- Average pressure in December: 30.07"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
Glen Rock, NJ
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in December
Glen Rock, NJ
- Average humidity in December: 78%
The months with the highest relative humidity are February and December (78%).
The months with the lowest relative humidity are April, July and August (72%).
Average rainfall in December
Glen Rock, NJ
- Average rainfall in December: 3.07"
The wettest months (with the highest rainfall) are July and December (3.07").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days in December
Glen Rock, NJ
- Average rainfall days in December: 11.2 days
The month with the highest number of rainy days is June (17 days).
The month with the least rainy days is January (8.9 days).
Average snowfall in December
Glen Rock, NJ
- Average snowfall in December: 1.54"
The month with the highest snowfall is February (3.23").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Glen Rock, NJ
- Average snowfall days in December: 4 days
The month with the highest number of snowfall days is February (7.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Glen Rock, 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 36min).
Average sunshine days in December
Glen Rock, 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 (10.5 days).
Average UV index in December
Glen Rock, 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
Glen Rock, NJ
- Average cloud cover in December: 48
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in December
Glen Rock, NJ
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
Glen Rock, New Jersey, USA
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