January weather forecast
Rocky Hill, NJ

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Weather in January

January, like December, in Rocky Hill, New Jersey, is an icy winter month, with an average temperature fluctuating between 24.3°F (-4.3°C) and 36.9°F (2.7°C).

Temperature

The coldest time of the year is January, with temperatures averaging a high of 36.9°F (2.7°C) and a low of 24.3°F (-4.3°C).

Humidity

In January, the average relative humidity is 75%.

Rainfall

In Rocky Hill, in January, during 6.1 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. Throughout the year, there are 119.3 rainfall days, and 12.72" (323mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, November and December. In Rocky Hill, in January, snow falls for 4.6 days, with typically accumulated 0.79" (20mm) of snow. In Rocky Hill, New Jersey, during the entire year, snow falls for 16.4 days and aggregates up to 4.41" (112mm) of snow.

Daylight

In Rocky Hill, the average length of the day in January is 9h and 41min.
On the first day of the month, sunrise is at 7:21 am and sunset at 4:42 pm. On the last day of January, sunrise is at 7:08 am and sunset at 5:14 pm EST.

Sunshine

The average sunshine in January is 5.1h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: An average UV index of 2 in January transforms into this advice:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Updated: Aug 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest?

January, on average, is the coldest month, registering a high temperature of 36.9°F (2.7°C) and a low of 24.3°F (-4.3°C).

How cold is January?

The high-temperature during January is 36.9°F (2.7°C) and the low-temperature is 24.3°F (-4.3°C).

What is the average humidity in January?

In January, the average relative humidity is 75%.

How many days does it rain in January?

In January, the rain falls for 6.1 days. Throughout January, 0.71" (18mm) of precipitation is accumulated.

How many days does it snow in January?

In Rocky Hill, in January, snow falls for 4.6 days, with typically accumulated 0.79" (20mm) of snow.

How many hours of daylight does Rocky Hill have in January?

The average day length in January is 9h and 41min.

What time are sunrise and sunset in January?

In January, on the first day of the month, sunrise is at 7:21 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 5:14 pm EST.

How many hours of sunshine does Rocky Hill have in January?

In January, the average sunshine duration is 5.1h.

What are the months with the lowest UV index in Rocky Hill?

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

How high is the UV index in January in Rocky Hill?

In January, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to UV radiation.
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
Rocky Hill, NJ

Average temperature in January - Rocky Hill, NJ
  • Average high temperature in January: 36.9°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (36.9°F).

  • Average low temperature in January: 24.3°F

The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure in January
Rocky Hill, NJ

Average pressure in January - Rocky Hill, 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).

Average wind speed in January
Rocky Hill, NJ

Average wind speed in January - Rocky Hill, NJ
  • Average wind speed in January: 8.5mph

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in January
Rocky Hill, NJ

Average humidity in January - Rocky Hill, NJ
  • Average humidity in January: 75%

The month with the highest relative humidity is October (79%).
The month with the lowest relative humidity is April (73%).

Average rainfall in January
Rocky Hill, NJ

Average rainfall in January - Rocky Hill, NJ
  • Average rainfall in January: 0.71"

The wettest month (with the highest rainfall) is July (1.69").
The driest month (with the least rainfall) is September (0.67").

Average rainfall days in January
Rocky Hill, NJ

Average rainfall days in January - Rocky Hill, NJ
  • Average rainfall days in January: 6.1 days

The month with the highest number of rainy days is July (13.9 days).
The month with the least rainy days is January (6.1 days).

Average snowfall in January
Rocky Hill, NJ

Average snowfall in January - Rocky Hill, NJ
  • Average snowfall in January: 0.79"

The month with the highest snowfall is March (1.42").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in January
Rocky Hill, NJ

Average snowfall days in January - Rocky Hill, NJ
  • Average snowfall days in January: 4.6 days

The month with the highest number of snowfall days is January (4.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in January /
Average sunshine in January
Rocky Hill, NJ

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

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in January: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in January
Rocky Hill, NJ

Average sunshine days in January - Rocky Hill, NJ
  • Average sunshine days in January: 21.8 days

The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is July (13.3 days).

Average UV index in January
Rocky Hill, NJ

Average UV index in January - Rocky Hill, 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).

Average cloud cover in January
Rocky Hill, NJ

Average cloud cover in January - Rocky Hill, NJ
  • Average cloud cover in January: 44

The months with the most cloud cover are February, March and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 33).

Average visibility in January
Rocky Hill, NJ

Average visibility in January - Rocky Hill, NJ
  • Average visibility in January: 6mi

The 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).

Rocky Hill, New Jersey, USA

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