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
Adelphia in December undergoes a slight reduction in the average high-temperature, shifting from November's fresh 52.3°F (11.3°C) to a frosty 43.7°F (6.5°C). In the month of December, the average temperature dips to a cold 34°F (1.1°C) during the night.Humidity
In December, the average relative humidity in Adelphia is 77%.Rainfall
The wettest months are July and December, with an average 3.7" (94mm) of rainfall.Snowfall
January through May, October through December are months with snowfall. In Adelphia, in December, during 3.8 snowfall days, 1.46" (37mm) of snow is typically accumulated. Throughout the year, there are 20.4 snowfall days, and 8.19" (208mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:00 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:41 pm EST.
Sunshine
In Adelphia, the average sunshine in December is 5.1h.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 of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In December, the maximum UV index of 2 suggests this advice:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. To protect against the Sun's most potent rays, avoid direct exposure around midday. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
What is the wettest month?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Adelphia have in December?
When are sunrise and sunset in December?
How many hours of sunshine does Adelphia have in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Adelphia, NJ
- Average high temperature in December: 43.7°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (37.8°F).
- Average low temperature in December: 34°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (27°F).
Average pressure in December
Adelphia, 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
Adelphia, NJ
- Average wind speed in December: 9.7mph
The windiest months (with the highest average wind speed) are January, February and March (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).
Average humidity in December
Adelphia, NJ
- Average humidity in December: 77%
The months with the highest relative humidity are May and June (79%).
The months with the lowest relative humidity are January, March and April (74%).
Average rainfall in December
Adelphia, NJ
- Average rainfall in December: 3.7"
The wettest months (with the highest rainfall) are July and December (3.7").
The driest month (with the least rainfall) is September (2.05").
Average rainfall days in December
Adelphia, NJ
- Average rainfall days in December: 12.6 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (9.6 days).
Average snowfall in December
Adelphia, NJ
- Average snowfall in December: 1.46"
The month with the highest snowfall is March (2.36").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Adelphia, NJ
- Average snowfall days in December: 3.8 days
The month with the highest number of snowfall days is January (5.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Adelphia, NJ
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 1min
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
Adelphia, NJ
- Average sunshine days in December: 15.9 days
The month with the most sunshine days is November (18.1 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in December
Adelphia, 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, November and December (UV index 2).
Average cloud cover in December
Adelphia, NJ
- Average cloud cover in December: 46
The month with the most cloud cover is February (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 29).
Average visibility in December
Adelphia, 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).
Adelphia, New Jersey, USA
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