December weather forecastUnion City, NJ
December
Weather in December
December in Union City confirms the arrival of winter as temperatures plummet to as low as 32.9°F (0.5°C). The short daylight hours and a decrease in sunshine, compared to long November's lights, dominate this month. With the city under the grip of a pronounced chill, and the days becoming increasingly short, outdoor activities take a backseat. The continuous drop in temperature coupled with frequent snowfall gives the city a beautiful snowy look. Despite the harsh weather conditions, the spirit of the holiday season keeps the city vibrant and lively.Temperature
In December, the meteorological conditions alter, with the average high-temperature shifting from a fresh 51.3°F (10.7°C) in November to an icy 42.1°F (5.6°C). Union City, during the nights of December, experiences an average temperature drop to a still wintry 32.9°F (0.5°C).Humidity
The months with the highest humidity are February and December, with an average relative humidity of 76%.Rainfall
December is the month with the most rainfall. Rain falls for 12.5 days and accumulates 3.78" (96mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Union City, in December, during 3.5 snowfall days, 1.61" (41mm) of snow is typically accumulated. Throughout the year, there are 22.7 snowfall days, and 10.79" (274mm) of snow is accumulated.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 7:01 am and sunset at 4:29 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:38 pm EST.
Sunshine
In December, the average sunshine is 4.9h.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 reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The daily high UV index of 2 in December translates into this advice:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Union City, NJ
- Average high temperature in December: 42.1°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (36.3°F).
- Average low temperature in December: 32.9°F
The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in December
Union City, NJ
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Union City, NJ
- Average wind speed in December: 9.2mph
The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).
Average humidity in December
Union City, NJ
- Average humidity in December: 76%
The months with the highest relative humidity are February and December (76%).
The month with the lowest relative humidity is August (70%).
Average rainfall in December
Union City, NJ
- Average rainfall in December: 3.78"
The wettest month (with the highest rainfall) is December (3.78").
The driest month (with the least rainfall) is September (2.2").
Average rainfall days in December
Union City, NJ
- Average rainfall days in December: 12.5 days
The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is January (9 days).
Average snowfall in December
Union City, NJ
- Average snowfall in December: 1.61"
The month with the highest snowfall is March (3.86").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Union City, NJ
- Average snowfall days in December: 3.5 days
The month with the highest number of snowfall days is February (6.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Union City, 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 54min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in December
Union City, NJ
- Average sunshine days in December: 15.9 days
The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is June (11.7 days).
Average UV index in December
Union City, 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
Union City, NJ
- Average cloud cover in December: 47
The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Union City, NJ
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
