January weather forecastRock Mill, NJ
January
Weather in January
January, the same as December, is a wintry winter month in Rock Mill, New Jersey, with an average temperature ranging between max 36.5°F (2.5°C) and min 23.5°F (-4.7°C).Temperature
January is the coldest month, with the temperature often reaching an average high of 36.5°F (2.5°C) and an average low of 23.5°F (-4.7°C).Humidity
The average relative humidity in January in Rock Mill is 76%.Rainfall
In Rock Mill, New Jersey, during January, the rain falls for 5.8 days and regularly aggregates up to 0.47" (12mm) of precipitation. Throughout the year, in Rock Mill, there are 107.3 rainfall days, and 8.82" (224mm) of precipitation is accumulated.Snowfall
Months with snowfall in Rock Mill are January through May, November and December. In January, in Rock Mill, it is snowing for 3.7 days. Throughout January, 0.47" (12mm) of snow is accumulated. Throughout the year, there are 15.5 snowfall days, and 2.76" (70mm) of snow is accumulated.Daylight
The average length of the day in January in Rock Mill is 9h and 41min.On the first day of January in Rock Mill, sunrise is at 7:22 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 5:15 pm EST.
Sunshine
The average sunshine in January is 5.1h.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 average person.Note: The maximum daily UV index of 2 in January converts into the following recommendations:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Rock Mill, NJ
- Average high temperature in January: 36.5°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (36.5°F).
- Average low temperature in January: 23.5°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).
Average pressure in January
Rock Mill, NJ
- Average pressure in January: 30.08"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
Rock Mill, NJ
- Average wind speed in January: 8.4mph
The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in January
Rock Mill, NJ
- Average humidity in January: 76%
The months with the highest relative humidity are February and October (79%).
The month with the lowest relative humidity is April (74%).
Average rainfall in January
Rock Mill, NJ
- Average rainfall in January: 0.47"
The wettest month (with the highest rainfall) is July (1.18").
The driest month (with the least rainfall) is September (0.35").
Average rainfall days in January
Rock Mill, NJ
- Average rainfall days in January: 5.8 days
The month with the highest number of rainy days is July (12.9 days).
The month with the least rainy days is November (5.5 days).
Average snowfall in January
Rock Mill, NJ
- Average snowfall in January: 0.47"
The month with the highest snowfall is March (0.75").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in January
Rock Mill, NJ
- Average snowfall days in January: 3.7 days
The month with the highest number of snowfall days is February (4.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Rock Mill, NJ
- Average daylight in January: 9h and 42min
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 6min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in January
Rock Mill, NJ
- Average sunshine days in January: 22.3 days
The month with the most sunshine days is November (22.7 days).
The month with the least sunshine days is July (13.6 days).
Average UV index in January
Rock Mill, 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, March, November and December (UV index 2).
Average cloud cover in January
Rock Mill, NJ
- Average cloud cover in January: 44
The months with the most cloud cover are February and December (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 33).
Average visibility in January
Rock Mill, 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).
