January weather forecast
Princeton, NJ

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An ancient stone building still stands strong in the neat fields and scenic trees of Princeton University, New Jersey
An ancient stone building still stands strong in the neat fields and scenic trees of Princeton University, New Jersey

Weather in January

As the year begins in Princeton, New Jersey, there's a chilling start with temperatures peaking at 36.9°F (2.7°C) and plummeting to a biting 24.3°F (-4.3°C). This is indeed the coldest period making it necessary to get the winter gear ready. Clouds dominate the majority of the day, reaching about 44% cloud coverage. Relatively moderate wind speeds provide a chilly ambiance, while scattered snowfalls mark the landscape white intermittently. As compared to the following months, January owns the shortest daylight duration illustrating winter's cold grip.

Temperature

January is the coldest month, with the temperature often reaching an average high of 36.9°F (2.7°C) and an average low of 24.3°F (-4.3°C).

Humidity

In Princeton, the average relative humidity in January is 75%.

Rainfall

In Princeton, in January, it is raining for 6.1 days, with typically 0.71" (18mm) of accumulated precipitation. Throughout the year, in Princeton, there are 119.3 rainfall days, and 12.72" (323mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, November and December. In January, it is snowing for 4.6 days. Throughout January, 0.79" (20mm) of snow is accumulated. Throughout the year, there are 16.4 snowfall days, and 4.41" (112mm) of snow is accumulated.

Daylight

The average length of the day in January is 9h and 41min.
On the first day of the month, sunrise is at 7:21 am and sunset at 4:42 pm. On the last day of January, sunrise is at 7:08 am and sunset at 5:15 pm EST.

Sunshine

In Princeton, the average sunshine in January is 5.1h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: An average maximum UV index of 2 in January leads to these recommendations:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.

Frequently asked questions

What are the coldest months?

Princeton's coldest temperatures are experienced in January, with average high temperatures of 36.9°F (2.7°C) and lows of 24.3°F (-4.3°C).

How cold is January?

In January, in Princeton, the average high-temperature is 36.9°F (2.7°C), and the average low-temperature is 24.3°F (-4.3°C).

What is the average humidity in January?

The average relative humidity in January is 75%.

How many days does it rain in January?

In January, in Princeton, the rain falls for 6.1 days. Throughout January, 0.71" (18mm) of precipitation is accumulated.

How much does it snow in January?

In Princeton, New Jersey, during January, snow falls for 4.6 days and regularly aggregates up to 0.79" (20mm) of snow.

How many hours of daylight does Princeton have in January?

The average day length in January is 9h and 41min.

When is the sunrise / sunset in January?

In January, on the first day of the month, sunrise is at 7:21 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 5:15 pm EST.

How many hours of sunshine does Princeton have in January?

The average sunshine duration in January is 5.1h.

What are the months with the lowest UV index?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index intensity in January?

In Princeton, the average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Princeton, NJ

Average temperature in January - Princeton, NJ
  • Average high temperature in January: 36.9°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 January: 24.3°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 January
Princeton, NJ

Average pressure in January - Princeton, NJ
  • Average pressure in January: 30.07"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 January
Princeton, NJ

Average wind speed in January - Princeton, NJ
  • Average wind speed in January: 8.5mph

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 January
Princeton, NJ

Average humidity in January - Princeton, NJ
  • Average humidity in January: 75%

The month with the highest relative humidity is October (79%).
The month with the lowest relative humidity is April (73%).

Average rainfall in January
Princeton, NJ

Average rainfall in January - Princeton, NJ
  • Average rainfall in January: 0.71"

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 January
Princeton, NJ

Average rainfall days in January - Princeton, NJ
  • Average rainfall days in January: 6.1 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 January
Princeton, NJ

Average snowfall in January - Princeton, NJ
  • Average snowfall in January: 0.79"

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 January
Princeton, NJ

Average snowfall days in January - Princeton, NJ
  • Average snowfall days in January: 4.6 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 January /
Average sunshine in January
Princeton, NJ

Average daylight in January / Average sunshine in January - Princeton, NJ
  • Average daylight in January: 9h and 4min

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 January: 5h and 1min

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 January
Princeton, NJ

Average sunshine days in January - Princeton, NJ
  • Average sunshine days in January: 21.8 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 January
Princeton, NJ

Average UV index in January - Princeton, NJ
  • Average UV index in January: 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 January
Princeton, NJ

Average cloud cover in January - Princeton, NJ
  • Average cloud cover in January: 44

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 January
Princeton, NJ

Average visibility in January - Princeton, NJ
  • Average visibility in January: 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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