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
The onset of December brings a small change in high-temperatures, falling from a fresh 50.5°F (10.3°C) in November to a cold 40.8°F (4.9°C). The average temperature drops to a freezing cold 29.5°F (-1.4°C) during the night in the month of December.Humidity
The months with the highest humidity are February, October and December, with an average relative humidity of 80%.Rainfall
In Morris Plains, during December, the rain falls for 10.9 days and regularly aggregates up to 2.4" (61mm) of precipitation. In Morris Plains, during the entire year, the rain falls for 157.9 days and collects up to 27.05" (687mm) of precipitation.Snowfall
January through May, November and December are months with snowfall. In December, in Morris Plains, New Jersey, it is snowing for 3.8 days. Throughout December, 1.06" (27mm) of snow is accumulated. In Morris Plains, during the entire year, snow falls for 24 days and aggregates up to 9.72" (247mm) of snow.Daylight
The month with the shortest days in Morris Plains is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:03 am and sunset at 4:30 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:40 pm EST.
Sunshine
In Morris Plains, 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 of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Frequently asked questions
How cold does it get in Morris Plains in December?
What is the most humid month in Morris Plains?
What is the average humidity in December in Morris Plains?
How much does it rain in Morris Plains in December?
How much does it snow in Morris Plains in December?
What is the month with the shortest days in Morris Plains?
How many hours of daylight does Morris Plains have in December?
When are sunrise and sunset in December in Morris Plains?
How many hours of sunshine does Morris Plains have in December?
What is the month with the lowest UV index in Morris Plains?
What is the UV index reading in December in Morris Plains?
Average temperature in December
Morris Plains, NJ
- Average high temperature in December: 40.8°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (34.9°F).
- Average low temperature in December: 29.5°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in December
Morris Plains, 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
Morris Plains, NJ
- Average wind speed in December: 7.6mph
The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Morris Plains, 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
Morris Plains, NJ
- Average rainfall in December: 2.4"
The wettest month (with the highest rainfall) is July (3.19").
The driest months (with the least rainfall) are January, February and September (1.57").
Average rainfall days in December
Morris Plains, NJ
- Average rainfall days in December: 10.9 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Morris Plains, NJ
- Average snowfall in December: 1.06"
The month with the highest snowfall is March (3.7").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Morris Plains, NJ
- Average snowfall days in December: 3.8 days
The month with the highest number of snowfall days is February (6.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Morris Plains, 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
Morris Plains, NJ
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is November (19 days).
The month with the least sunshine days is July (10.9 days).
Average UV index in December
Morris Plains, 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
Morris Plains, NJ
- Average cloud cover in December: 49
The months with the most cloud cover are February, March and December (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 34).
Average visibility in December
Morris Plains, NJ
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, July, August, October, November and December (6mi).
The months with the lowest visibility are May, June and September (5mi).
Morris Plains, New Jersey, USA
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