January weather forecast
Penns Grove, NJ

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Weather in January

January, the same as December, is a wintry winter month in Penns Grove, New Jersey, with temperature in the range of an average low of 26.2°F (-3.2°C) and an average high of 37.9°F (3.3°C).

Temperature

January tends to be the coldest month, with temperatures averaging a daily high of 37.9°F (3.3°C) and a low of 26.2°F (-3.2°C).

Humidity

In January, the average relative humidity in Penns Grove is 74%.

Rainfall

In January, the rain falls for 9.5 days. Throughout January, 1.77" (45mm) of precipitation is accumulated. In Penns Grove, during the entire year, the rain falls for 150.6 days and collects up to 26.46" (672mm) of precipitation.

Snowfall

Months with snowfall in Penns Grove are January through May, November and December. In January, it is snowing for 5.3 days. Throughout January, 1.57" (40mm) of snow is accumulated. Throughout the year, there are 16.2 snowfall days, and 6.93" (176mm) of snow is accumulated.

Ocean temperature

In January, the average ocean temperature in Penns Grove is 41.9°F (5.5°C).
Note: Swimming in 41.9°F (5.5°C) at temperatures under 50°F (10°C) requires thermal swimsuits; otherwise, one can face cold shock and breathing difficulty. Even brief immersion at 55.4°F (13°C) feels frosty.

Daylight

In January, the average length of the day in Penns Grove is 9h and 44min.
On the first day of January in Penns Grove, sunrise is at 7:22 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 5:19 pm EST.

Sunshine

In January, the average sunshine in Penns Grove is 5.1h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the average person.
Note: In January, the UV index of 2 transforms into the following advice:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
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Frequently asked questions

What part of the year is the coldest in Penns Grove?

Penns Grove's coldest temperatures are experienced in January, with average high temperatures of 37.9°F (3.3°C) and lows of 26.2°F (-3.2°C).

Is it cold in Penns Grove during January?

In Penns Grove, in January, the average high-temperature is 37.9°F (3.3°C), and the average low-temperature is 26.2°F (-3.2°C).

What is the average humidity in January in Penns Grove?

In Penns Grove, the average relative humidity in January is 74%.

How much does it rain in Penns Grove in January?

In Penns Grove, New Jersey, in January, it is raining for 9.5 days, with typically 1.77" (45mm) of accumulated precipitation.

How many days does it snow in January in Penns Grove?

In January, it is snowing for 5.3 days. Throughout January, 1.57" (40mm) of snow is accumulated.

How cold is the water in January in Penns Grove?

In Penns Grove, New Jersey, in January, the average water temperature is 41.9°F (5.5°C). Swimming in 41.9°F (5.5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Penns Grove have in January?

The average day length in January in Penns Grove, New Jersey, is 9h and 44min.

What time are sunrise and sunset in January in Penns Grove?

On the first day of January in Penns Grove, sunrise is at 7:22 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 5:19 pm EST.

How many hours of sunshine does Penns Grove have in January?

In Penns Grove, the average sunshine duration in January is 5.1h.

What is the month with the lowest UV index in Penns Grove?

The months with the lowest UV index in Penns Grove are January, February, November and December, with an average maximum UV index of 2.

What is the UV index reading in January in Penns Grove?

The average daily maximum UV index in January in Penns Grove is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from 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
Penns Grove, NJ

Average temperature in January - Penns Grove, NJ
  • Average high temperature in January: 37.9°F

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (37.9°F).

  • Average low temperature in January: 26.2°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

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Average pressure in January
Penns Grove, NJ

Average pressure in January - Penns Grove, NJ
  • Average pressure in January: 30.09"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in January
Penns Grove, NJ

Average wind speed in January - Penns Grove, NJ
  • Average wind speed in January: 8.6mph

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

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Average humidity in January
Penns Grove, NJ

Average humidity in January - Penns Grove, NJ
  • Average humidity in January: 74%

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

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Average rainfall in January
Penns Grove, NJ

Average rainfall in January - Penns Grove, NJ
  • Average rainfall in January: 1.77"

The wettest month (with the highest rainfall) is August (2.68").
The driest month (with the least rainfall) is September (1.61").

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Average rainfall days in January
Penns Grove, NJ

Average rainfall days in January - Penns Grove, NJ
  • Average rainfall days in January: 9.5 days

The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is November (8.5 days).

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Average snowfall in January
Penns Grove, NJ

Average snowfall in January - Penns Grove, NJ
  • Average snowfall in January: 1.57"

The month with the highest snowfall is March (2.2").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in January
Penns Grove, NJ

Average snowfall days in January - Penns Grove, NJ
  • Average snowfall days in January: 5.3 days

The month with the highest number of snowfall days is January (5.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average sea temperature in January
Penns Grove, NJ

Average sea temperature in January - Penns Grove, NJ
  • Average sea temperature in January: 41.8°F

The best month for swimming (with the highest average sea temperature) is August (75.9°F).
The coldest month (with the lowest average sea temperature) is February (39.9°F).

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Average daylight in January /
Average sunshine in January
Penns Grove, NJ

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

The month with the longest days is June (Average daylight: 14h and 54min).
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 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

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Average sunshine days in January
Penns Grove, NJ

Average sunshine days in January - Penns Grove, NJ
  • Average sunshine days in January: 17.6 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is May (12.2 days).

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Average UV index in January
Penns Grove, NJ

Average UV index in January - Penns Grove, NJ
  • Average UV index in January: 2

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

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Average cloud cover in January
Penns Grove, NJ

Average cloud cover in January - Penns Grove, NJ
  • Average cloud cover in January: 44

The months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in January
Penns Grove, NJ

Average visibility in January - Penns Grove, NJ
  • Average visibility in January: 6mi

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

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Penns Grove, New Jersey, USA

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