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
With the arrival of December, Princeton experiences a modest decline in average high-temperatures, transitioning from a cool 51.8°F (11°C) in November to a frosty 43°F (6.1°C). The average nighttime temperature in Princeton, New Jersey, lowers to a freezing cold 31.1°F (-0.5°C) throughout December.Humidity
The average relative humidity in December in Princeton is 78%.Rainfall
In Princeton, in December, it is raining for 8.2 days, with typically 1.26" (32mm) of accumulated precipitation. Throughout the year, there are 119.3 rainfall days, and 12.72" (323mm) of precipitation is accumulated.Snowfall
January through May, November and December are months with snowfall in Princeton. In Princeton, in December, during 2.7 snowfall days, 0.75" (19mm) of snow is typically accumulated. In Princeton, New Jersey, during the entire year, snow falls for 16.4 days and aggregates up to 4.41" (112mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of December in Princeton, sunrise is at 7:02 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:42 pm EST.
Sunshine
In December, the average sunshine in Princeton is 5h.UV index
The months with the lowest UV index in Princeton 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 minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: The daily maximum UV index of 2 in December interprets into the following advice:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Avoiding the Sun during its peak radiation time around midday is a healthy practice. During bright days, sunglasses that offer UVA and UVB defense are recommended. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Frequently asked questions
Is December cold in Princeton?
What is the average humidity in December in Princeton?
How much does it rain in Princeton in December?
How many days does it snow in December in Princeton?
What is the month with the shortest days in Princeton?
What is the average length of the day in December in Princeton?
When is the sunrise / sunset in December in Princeton?
How long on average sun shines in December in Princeton?
What are the months with the lowest UV index in Princeton?
What is the UV index reading in December in Princeton?
Average temperature in December
Princeton, NJ
- Average high temperature in December: 43°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (36.9°F).
- Average low temperature in December: 31.1°F
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in December
Princeton, 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
Princeton, NJ
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity in December
Princeton, NJ
- Average humidity in December: 78%
The month with the highest relative humidity is October (79%).
The month with the lowest relative humidity is April (73%).
Average rainfall in December
Princeton, NJ
- Average rainfall in December: 1.26"
The wettest month (with the highest rainfall) is July (1.69").
The driest month (with the least rainfall) is September (0.67").
Average rainfall days in December
Princeton, NJ
- Average rainfall days in December: 8.2 days
The month with the highest number of rainy days is July (13.9 days).
The month with the least rainy days is January (6.1 days).
Average snowfall in December
Princeton, NJ
- Average snowfall in December: 0.75"
The month with the highest snowfall is March (1.42").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Princeton, NJ
- Average snowfall days in December: 2.7 days
The month with the highest number of snowfall days is January (4.6 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
Princeton, 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 0min
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
Princeton, NJ
- Average sunshine days in December: 20.5 days
The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in December
Princeton, 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
Princeton, NJ
- Average cloud cover in December: 47
The months with the most cloud cover are February, March and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 33).
Average visibility in December
Princeton, 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).
Princeton, New Jersey, USA
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