Trenton
New Jersey, USA
Long-term weather forecast
Long-term weather forecast

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, like December, in Trenton, New Jersey, is another cold winter month, with average temperature fluctuating between 39°F (3.9°C) and 23.2°F (-4.9°C).

Temperature

January is the coldest month, with an average high-temperature of 39°F (3.9°C) and an average low-temperature of 23.2°F (-4.9°C).

Rainfall

In Trenton, during January, the rain falls for 10 days and regularly aggregates up to 3.2" (80.3mm) of precipitation. Throughout the year, in Trenton, there are 118 rainfall days, and 46.4" (1179.7mm) of precipitation is accumulated.

Daylight

In Trenton, the average length of the day is 9.7h.

Sunshine

The average sunshine in January is 5.3h.

UV index

January, 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 the Sun's UV rays for ordinary individuals.
In January, the average maximum UV index of 2 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the coldest month in Trenton?

With an average high-temperature of 39°F (3.9°C) and an average low-temperature of 23.2°F (-4.9°C), January is the coldest month in Trenton.

What is the temperature in January in Trenton?

The average high-temperature, in January, is 39°F (3.9°C), while the average low-temperature is 23.2°F (-4.9°C).

How much does it rain in Trenton in January?

In January, in Trenton, the rain falls for 10 days. Throughout January, 3.2" (80.3mm) of precipitation is accumulated.

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 long on average sun shines in January in Trenton?

In January, the average sunshine in Trenton is 5.3h.

When is the lowest UV index in Trenton?

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

What is the UV index intensity in January in Trenton?

In January, the average daily maximum UV index in Trenton, New Jersey, is 2. A UV Index of 2, and less, symbolizes a low health threat from unprotected exposure to the UV radiation.
Average temperature in January - Trenton, NJ
  • Average high temperature in January: 3.9°C

The warmest month (with the highest average high temperature) is July (29.6°C).
The month with the lowest average high temperature is January (3.9°C).

  • Average low temperature in January: -4.9°C

The month with the highest average low temperature is July (18.9°C).
The coldest month (with the lowest average low temperature) is January (-4.9°C).

Average rainfall in January - Trenton, NJ
  • Average rainfall in January: 80.3mm

The wettest month (with the highest rainfall) is July (125.7mm).
The driest month (with the lowest rainfall) is February (58.7mm).

Average rainfall days in January - Trenton, NJ
  • Average rainfall days in January: 10 days

Months with the highest number of rainy days are March, April, May and December (11 days).
Months with the lowest number of rainy days are September and October (8 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 shortest days is December (Average daylight: 9.4h).

  • Average sunshine in January: 5.3h

The month with most sunshine is June (Average sunshine: 8.8h).
The month with least sunshine is December (Average sunshine: 4.5h).

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

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 2).