December weather forecastCaldwell, NJ
December
Weather in December
The first month of the winter, December, is still a cold month in Caldwell, New Jersey, with an average temperature varying between 40.8°F (4.9°C) and 30.4°F (-0.9°C).Temperature
December comes with a decrease in the average high-temperature, falling from a fresh 50.5°F (10.3°C) in November to an icy 40.8°F (4.9°C). Caldwell anticipates an average minimum temperature of 30.4°F (-0.9°C) in the month of December.Humidity
The months with the highest humidity in Caldwell, New Jersey, are February and December, with an average relative humidity of 79%.Rainfall
In Caldwell, in December, it is raining for 10.1 days, with typically 2.48" (63mm) of accumulated precipitation. In Caldwell, during the entire year, the rain falls for 158 days and collects up to 27.4" (696mm) of precipitation.Snowfall
Months with snowfall are January through May, November and December. In Caldwell, in December, during 4.4 snowfall days, 1.18" (30mm) of snow is typically accumulated. In Caldwell, New Jersey, during the entire year, snow falls for 24.3 days and aggregates up to 9.96" (253mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year in Caldwell.On the first day of the month, sunrise is at 7:02 am and sunset at 4:30 pm. On the last day of December, in Caldwell, sunrise is at 7:21 am and sunset at 4:39 pm EST.
Sunshine
In December, the average sunshine in Caldwell, New Jersey, 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 estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Stay sun-safe with clothing that is both closely woven and worn loosely. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Caldwell, NJ
- Average high temperature in December: 40.8°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (34.9°F).
- Average low temperature in December: 30.4°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure in December
Caldwell, 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
Caldwell, NJ
- Average wind speed in December: 7.7mph
The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in December
Caldwell, NJ
- Average humidity in December: 79%
The months with the highest relative humidity are February and December (79%).
The months with the lowest relative humidity are April and August (73%).
Average rainfall in December
Caldwell, NJ
- Average rainfall in December: 2.48"
The wettest month (with the highest rainfall) is July (3.15").
The driest month (with the least rainfall) is January (1.57").
Average rainfall days in December
Caldwell, NJ
- Average rainfall days in December: 10.1 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in December
Caldwell, NJ
- Average snowfall in December: 1.18"
The month with the highest snowfall is March (3.58").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Caldwell, NJ
- Average snowfall days in December: 4.4 days
The month with the highest number of snowfall days is February (7 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
Caldwell, NJ
- Average daylight in December: 9h and 18min
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 48min
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
Caldwell, NJ
- Average sunshine days in December: 17.4 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is July (10.7 days).
Average UV index in December
Caldwell, 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
Caldwell, 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
Caldwell, 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).
