January weather forecast and climate
Trenton, NJ

A full aerial view of Trenton, New Jersey, with the George Washington statue
A full aerial view of Trenton, New Jersey, with the George Washington statue
January, the same as December, is another cold winter month in Trenton, New Jersey, with average temperature varying between 24.8°F (-4°C) and 36.9°F (2.7°C).

Temperature

With an average high-temperature of 36.9°F (2.7°C) and an average low-temperature of 24.8°F (-4°C), January is the coldest month.

Humidity

The average relative humidity in Trenton is 75%.

Rainfall

The month with the least rainfall is January when the rain falls for 7.9 days and typically collects 1.85" (47mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Trenton, New Jersey, during January, snow falls for 4.8 days and regularly aggregates up to 1.69" (43mm) of snow. In Trenton, during the entire year, snow falls for 16.6 days, and aggregates up to 8.86" (225mm) of snow.

Daylight

The average length of the day in Trenton is 9.7h.

Sunshine

The average sunshine in Trenton is 5.1h.

UV index

Months with the lowest UV index in Trenton 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 the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 2 in January transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the coldest month in Trenton?

The coldest month in Trenton is January, with an average high-temperature of 36.9°F (2.7°C) and an average low-temperature of 24.8°F (-4°C).

What is the temperature in January in Trenton?

In Trenton, in January, the average high-temperature is 36.9°F (2.7°C), and the average low-temperature is 24.8°F (-4°C).

What is the average humidity in January in Trenton?

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

How much does it rain in Trenton in January?

In January, the rain falls for 7.9 days. Throughout January, 1.85" (47mm) of precipitation is accumulated.

What is the driest month in Trenton?

January is the month with the least rainfall in Trenton. Rain falls for 7.9 days and accumulates 1.85" (47mm) of precipitation.

How much does it snow in Trenton in January?

In Trenton, in January, snow falls for 4.8 days, with typically accumulated 1.69" (43mm) of snow.

What is the average length of the day in January in Trenton?

In January, the average length of the day in Trenton, New Jersey, is 9.7h.

How many hours of sunshine does Trenton have in January?

In Trenton, New Jersey, the average sunshine in January is 5.1h.

What are the months with the lowest UV index in Trenton?

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

What is the UV index reading in January in Trenton?

In Trenton, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV radiation.
Average temperature in January - Trenton, NJ
  • Average high temperature in January: 36.9°F

The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is January (36.9°F).

  • Average low temperature in January: 24.8°F

The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).

Average pressure in January - Trenton, NJ
  • Average pressure in January: 30.08"

The month with the highest atmospheric pressure is November (30.11").
The month with the lowest atmospheric pressure is June (29.93").

Average wind speed in January - Trenton, NJ
  • Average wind speed in January: 8.3mph

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

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

Months with the highest relative humidity are February and October (78%).
The month with the lowest relative humidity is April (72%).

Average rainfall in January - Trenton, NJ
  • Average rainfall in January: 1.85"

The wettest month (with the highest rainfall) is July (3.74").
The driest month (with the least rainfall) is January (1.85").

Average rainfall days in January - Trenton, NJ
  • Average rainfall days in January: 7.9 days

The month with the highest number of rainy days is July (18.5 days).
The month with the least rainy days is January (7.9 days).

Average snowfall in January - Trenton, NJ
  • Average snowfall in January: 1.69"

The month with the highest snowfall is March (2.72").
Months with the least snowfall are June, July, August and September (0").

Average snowfall days in January - Trenton, NJ
  • Average snowfall days in January: 4.8 days

The month with the highest number of snowfall days is January (4.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in January / Average sunshine in January - Trenton, NJ
  • Average daylight in January: 9.7h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in January: 5.1h

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.8h).

Average sunshine days in January - Trenton, NJ
  • Average sunshine days in January: 19.5 days

The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is July (9.3 days).

Average UV index in January - Trenton, NJ
  • Average UV index in January: 2

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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

Months with the most cloud cover are February, March and December (Cloud cover 47).
Months with the least cloud cover are July and August (Cloud cover 32).

Average visibility in January - Trenton, NJ
  • Average visibility in January: 6mi

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).