January weather forecast and climate
Delaware, NJ

Weather in January

January, the same as December, is another cold winter month in Delaware, New Jersey, with average temperature varying between 19.8°F (-6.8°C) and 32.5°F (0.3°C).

Temperature

With an average high-temperature of 32.5°F (0.3°C) and an average low-temperature of 19.8°F (-6.8°C), January is the coldest month.

Humidity

The average relative humidity in January is 79%.

Rainfall

In Delaware, New Jersey, during January, the rain falls for 9.6 days and regularly aggregates up to 2.24" (57mm) of precipitation. In Delaware, during the entire year, the rain falls for 165.9 days and collects up to 31.61" (803mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Delaware, in January, snow falls for 11.4 days, with typically accumulated 5.28" (134mm) of snow. In Delaware, during the entire year, snow falls for 42.7 days, and aggregates up to 21.26" (540mm) of snow.

Daylight

In Delaware, the average length of the day is 9.6h.

Sunshine

The average sunshine in Delaware is 4.7h.

UV index

In Delaware, the average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 2 in January transform into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Delaware?

With an average high-temperature of 32.5°F (0.3°C) and an average low-temperature of 19.8°F (-6.8°C), January is the coldest month in Delaware.

What is the temperature in January in Delaware?

In Delaware, New Jersey, in January, the average high-temperature is 32.5°F (0.3°C), and the average low-temperature is 19.8°F (-6.8°C).

What is the average humidity in January in Delaware?

In Delaware, the average relative humidity in January is 79%.

How many days does it rain in January in Delaware?

In Delaware, New Jersey, in January, it is raining for 9.6 days, with typically 2.24" (57mm) of accumulated precipitation.

How much does it snow in Delaware in January?

In Delaware, in January, during 11.4 snowfall days, 5.28" (134mm) of snow is typically accumulated.

How many hours of daylight does Delaware have in January?

The average length of the day in January is 9.6h.

How many hours of sunshine does Delaware have in January?

The average sunshine in January in Delaware is 4.7h.

How high is the UV index in January in Delaware?

In January, the average daily maximum UV index in Delaware, New Jersey, is 2. A UV Index estimate of 2, and below, represents a low health threat from the exposure to the Sun's UV rays.

Average temperature in January
Delaware, NJ

Average temperature in January - Delaware, NJ
  • Average high temperature in January: 32.5°F

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (32.5°F).

  • Average low temperature in January: 19.8°F

The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

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Average pressure in January
Delaware, NJ

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

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

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Average wind speed in January
Delaware, NJ

Average wind speed in January - Delaware, NJ
  • Average wind speed in January: 7.8mph

The windiest months (with the highest average wind speed) are January, February and March (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

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Average humidity in January
Delaware, NJ

Average humidity in January - Delaware, NJ
  • Average humidity in January: 79%

Months with the highest relative humidity are February, October and December (82%).
The month with the lowest relative humidity is April (76%).

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Average rainfall in January
Delaware, NJ

Average rainfall in January - Delaware, NJ
  • Average rainfall in January: 2.24"

The wettest month (with the highest rainfall) is July (3.11").
The driest month (with the least rainfall) is September (1.81").

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Average rainfall days in January
Delaware, NJ

Average rainfall days in January - Delaware, NJ
  • Average rainfall days in January: 9.6 days

The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is February (9.5 days).

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Average snowfall in January
Delaware, NJ

Average snowfall in January - Delaware, NJ
  • Average snowfall in January: 5.28"

The month with the highest snowfall is February (5.67").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
Delaware, NJ

Average snowfall days in January - Delaware, NJ
  • Average snowfall days in January: 11.4 days

The month with the highest number of snowfall days is January (11.4 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in January /
Average sunshine in January
Delaware, NJ

Average daylight in January / Average sunshine in January - Delaware, NJ
  • Average daylight in January: 9.6h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in January: 4.7h

The month with the most sunshine is July (Average sunshine: 10.2h).
The month with the least sunshine is February (Average sunshine: 4.3h).

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Average sunshine days in January
Delaware, NJ

Average sunshine days in January - Delaware, NJ
  • Average sunshine days in January: 15 days

The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is June (11.1 days).

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Average UV index in January
Delaware, NJ

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

The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in January
Delaware, NJ

Average cloud cover in January - Delaware, NJ
  • Average cloud cover in January: 49

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 35).

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Average visibility in January
Delaware, NJ

Average visibility in January - Delaware, NJ
  • Average visibility in January: 5mi

The month with the highest visibility is April (6mi).
Months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).

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