December weather forecastGlassboro, NJ
December
Weather in December
December, the first month of the winter in Glassboro, is still a chilly month, with an average temperature ranging between min 32.9°F (0.5°C) and max 44.2°F (6.8°C).Temperature
Glassboro's weather in December involves a decrease in the average high-temperature, moving down from November's fresh 53.4°F (11.9°C) to a chilly 44.2°F (6.8°C). In Glassboro, the expected average low-temperature for December is a wintry 32.9°F (0.5°C).Humidity
In December, the average relative humidity is 77%.Rainfall
December is the month with the most rainfall in Glassboro. Rain falls for 11 days and accumulates 3.35" (85mm) of precipitation.Snowfall
January through May, November and December are months with snowfall in Glassboro. In Glassboro, in December, during 3 snowfall days, 1.26" (32mm) of snow is typically accumulated. Throughout the year, there are 17.8 snowfall days, and 10.28" (261mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:02 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:46 pm EST.
Sunshine
The average sunshine in December in Glassboro, New Jersey, is 5.2h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 2 in December translates into these instructions:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Glassboro, NJ
- Average high temperature in December: 44.2°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (38.1°F).
- Average low temperature in December: 32.9°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).
Average pressure in December
Glassboro, NJ
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Glassboro, NJ
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is April (8.7mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in December
Glassboro, NJ
- Average humidity in December: 77%
The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (71%).
Average rainfall in December
Glassboro, NJ
- Average rainfall in December: 3.35"
The wettest month (with the highest rainfall) is December (3.35").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days in December
Glassboro, NJ
- Average rainfall days in December: 11 days
The month with the highest number of rainy days is July (16.9 days).
The month with the least rainy days is January (8.8 days).
Average snowfall in December
Glassboro, NJ
- Average snowfall in December: 1.26"
The month with the highest snowfall is March (3.54").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Glassboro, NJ
- Average snowfall days in December: 3 days
The month with the highest number of snowfall days is January (5.5 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
Glassboro, NJ
- Average daylight in December: 9h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in December
Glassboro, NJ
- Average sunshine days in December: 17.9 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (11.8 days).
Average UV index in December
Glassboro, NJ
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Glassboro, NJ
- Average cloud cover in December: 45
The months with the most cloud cover are February and March (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility in December
Glassboro, 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).
