January weather forecast
Whippany, NJ

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Weather in January

January, the same as December, is another cold winter month in Whippany, New Jersey, with an average temperature fluctuating between 22.5°F (-5.3°C) and 34.9°F (1.6°C).

Temperature

The coldest temperatures occur during January, when averages reach a peak of 34.9°F (1.6°C) and a low of 22.5°F (-5.3°C).

Humidity

The average relative humidity in January is 77%.

Rainfall

January, February and September are months with the least rain when the rain falls for 8.3 days and typically aggregates up to 1.57" (40mm) of rain.

Snowfall

January through May, November and December are months with snowfall in Whippany. In Whippany, in January, snow falls for 6.6 days, with typically accumulated 1.77" (45mm) of snow. Throughout the year, there are 24 snowfall days, and 9.72" (247mm) of snow is accumulated.

Daylight

The average length of the day in January is 9h and 38min.
On the first day of January, sunrise is at 7:21 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 5:13 pm EST.

Sunshine

The average sunshine in January is 4.9h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Whippany, New Jersey. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.
Note: In January, the maximum UV index of 2 translates into these guidelines:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
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Frequently asked questions

What is the coldest time of year in Whippany?

January is the month when Whippany, New Jersey, experiences its coldest temperatures, averaging a high of 34.9°F (1.6°C) and a low of 22.5°F (-5.3°C).

How cold is it in Whippany in January?

The high-temperature in Whippany, New Jersey, during January is 34.9°F (1.6°C) and the low-temperature is 22.5°F (-5.3°C).

What is the average humidity in January in Whippany?

In January, the average relative humidity in Whippany is 77%.

What is the driest month in Whippany?

January, February and September are months with the least rain in Whippany, New Jersey, when the rain falls for 8.3 days and typically aggregates up to 1.57" (40mm) of rain.

How many days does it rain in January in Whippany?

In Whippany, in January, during 8.3 rainfall days, 1.57" (40mm) of precipitation is typically accumulated.

How many days does it snow in January in Whippany?

In Whippany, in January, snow falls for 6.6 days, with typically accumulated 1.77" (45mm) of snow.

How many hours of daylight does Whippany have in January?

In Whippany, the average day length in January is 9h and 38min.

What time are sunrise and sunset in January in Whippany?

In January, on the first day of the month, sunrise is at 7:21 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 5:13 pm EST.

How long on average sun shines in January in Whippany?

The average sunshine duration in January is 4.9h.

When is the lowest UV index in Whippany?

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

What is the UV index reading in January in Whippany?

The average daily maximum UV index in January in Whippany, New Jersey, is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to Sun's UV rays.
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
Whippany, NJ

Average temperature in January - Whippany, NJ
  • Average high temperature in January: 34.9°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (34.9°F).

  • Average low temperature in January: 22.5°F

The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

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Average pressure in January
Whippany, NJ

Average pressure in January - Whippany, 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).

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Average wind speed in January
Whippany, NJ

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

The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

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Average humidity in January
Whippany, NJ

Average humidity in January - Whippany, NJ
  • Average humidity in January: 77%

The months with the highest relative humidity are February, October and December (80%).
The month with the lowest relative humidity is April (74%).

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Average rainfall in January
Whippany, NJ

Average rainfall in January - Whippany, NJ
  • Average rainfall in January: 1.57"

The wettest month (with the highest rainfall) is July (3.19").
The driest months (with the least rainfall) are January, February and September (1.57").

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Average rainfall days in January
Whippany, NJ

Average rainfall days in January - Whippany, NJ
  • Average rainfall days in January: 8.3 days

The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (8.3 days).

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Average snowfall in January
Whippany, NJ

Average snowfall in January - Whippany, NJ
  • Average snowfall in January: 1.77"

The month with the highest snowfall is March (3.7").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in January
Whippany, NJ

Average snowfall days in January - Whippany, NJ
  • Average snowfall days in January: 6.6 days

The month with the highest number of snowfall days is February (6.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in January: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in January
Whippany, NJ

Average sunshine days in January - Whippany, NJ
  • Average sunshine days in January: 18.3 days

The month with the most sunshine days is November (19 days).
The month with the least sunshine days is July (10.9 days).

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Average UV index in January
Whippany, NJ

Average UV index in January - Whippany, 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).

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Average cloud cover in January
Whippany, NJ

Average cloud cover in January - Whippany, NJ
  • Average cloud cover in January: 46

The months with the most cloud cover are February, March and December (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 34).

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Average visibility in January
Whippany, NJ

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

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

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Whippany, New Jersey, USA

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