December weather forecastSwartswood, NJ
December
Weather in December
December, the first month of the winter in Swartswood, is also a wintry month, with an average temperature varying between 27.3°F (-2.6°C) and 38.7°F (3.7°C).Temperature
A subtle decrease in the average high-temperature marks December, falling from November's chilly 48.4°F (9.1°C) to a cold 38.7°F (3.7°C). In December, Swartswood reports a consistent average low-temperature of 27.3°F (-2.6°C) during the nights.Humidity
The months with the highest humidity are February and December, with an average relative humidity of 82%.Rainfall
In Swartswood, New Jersey, in December, during 11.5 rainfall days, 2.68" (68mm) of precipitation is typically accumulated. In Swartswood, during the entire year, the rain falls for 161.1 days and collects up to 28.98" (736mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Swartswood, during December, snow falls for 6.5 days and regularly aggregates up to 2.83" (72mm) of snow. Throughout the year, there are 36.8 snowfall days, and 17.52" (445mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:05 am and sunset at 4:31 pm. On the last day of December, sunrise is at 7:24 am and sunset at 4:40 pm EST.
Sunshine
In December, the average sunshine is 4.6h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.Note: In December, a regular UV index of 1 translates into these guidelines:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Swartswood, NJ
- Average high temperature in December: 38.7°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (33.3°F).
- Average low temperature in December: 27.3°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in December
Swartswood, 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
Swartswood, NJ
- Average wind speed in December: 7.1mph
The windiest month (with the highest average wind speed) is March (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in December
Swartswood, NJ
- Average humidity in December: 82%
The months with the highest relative humidity are February and December (82%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
Swartswood, NJ
- Average rainfall in December: 2.68"
The wettest month (with the highest rainfall) is July (3.03").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in December
Swartswood, NJ
- Average rainfall days in December: 11.5 days
The months with the highest number of rainy days are May and July (17.3 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in December
Swartswood, NJ
- Average snowfall in December: 2.83"
The months with the highest snowfall are January and February (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Swartswood, NJ
- Average snowfall days in December: 6.5 days
The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Swartswood, 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 36min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).
Average sunshine days in December
Swartswood, NJ
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is June (11.3 days).
Average UV index in December
Swartswood, NJ
- Average UV index in December: 1
The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Swartswood, NJ
- Average cloud cover in December: 51
The month with the most cloud cover is February (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 37).
Average visibility in December
Swartswood, NJ
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
