Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
January is the coldest month, with an average high-temperature of 35.4°F (1.9°C) and an average low-temperature of 24.1°F (-4.4°C).Humidity
In January, the average relative humidity is 75%.Rainfall
In January, the rain falls for 8.2 days. Throughout January, 2.2" (56mm) of precipitation is accumulated. In Rockleigh, during the entire year, the rain falls for 153.9 days and collects up to 30.75" (781mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Rockleigh, during January, snow falls for 6.9 days and regularly aggregates up to 2.17" (55mm) of snow. In Rockleigh, during the entire year, snow falls for 25.5 days and aggregates up to 10.55" (268mm) of snow.Daylight
The average length of the day in January is 9h and 38min.On the first day of the month, sunrise is at 7:20 am and sunset at 4:37 pm. On the last day of January, sunrise is at 7:07 am and sunset at 5:10 pm EST.
Sunshine
In Rockleigh, New Jersey, the average sunshine in January is 5h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: An average maximum UV index of 2 in January leads to these recommendations:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. It's recommended to limit sun exposure when its radiation is at its peak during midday. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
How cold is January?
What is the average humidity in January in Rockleigh?
How much does it rain in January?
How much does it snow in January?
How many hours of daylight does Rockleigh have in January?
When are sunrise and sunset in January?
How many hours of sunshine does Rockleigh have in January?
When is the lowest UV index?
What is the UV index reading in January?
Average temperature in January
Rockleigh, NJ
- Average high temperature in January: 35.4°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (35.4°F).
- Average low temperature in January: 24.1°F
The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (24.1°F).
Average pressure in January
Rockleigh, NJ
- Average pressure in January: 30.06"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in January
Rockleigh, NJ
- Average wind speed in January: 8.5mph
The windiest months (with the highest average wind speed) are January and March (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in January
Rockleigh, NJ
- Average humidity in January: 75%
The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is August (68%).
Average rainfall in January
Rockleigh, NJ
- Average rainfall in January: 2.2"
The wettest month (with the highest rainfall) is December (3.46").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days in January
Rockleigh, NJ
- Average rainfall days in January: 8.2 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (8.2 days).
Average snowfall in January
Rockleigh, NJ
- Average snowfall in January: 2.17"
The month with the highest snowfall is March (3.07").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Rockleigh, NJ
- Average snowfall days in January: 6.9 days
The month with the highest number of snowfall days is January (6.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Rockleigh, 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: 5h and 0min
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).
Average sunshine days in January
Rockleigh, NJ
- Average sunshine days in January: 18.1 days
The months with the most sunshine days are January and November (18.1 days).
The months with the least sunshine days are April and June (12.7 days).
Average UV index in January
Rockleigh, 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
Rockleigh, NJ
- Average cloud cover in January: 45
The months with the most cloud cover are February, March and December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in January
Rockleigh, 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).
Rockleigh, New Jersey, USA
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