January weather forecastHackettstown, NJ
January
Weather in January
January, the same as December, is an icy winter month in Hackettstown, New Jersey, with temperature in the range of an average high of 33.8°F (1°C) and an average low of 21°F (-6.1°C).Temperature
January, having an average high-temperature of 33.8°F (1°C) and an average low-temperature of 21°F (-6.1°C), is the coldest month.Humidity
The average relative humidity in January is 78%.Rainfall
In January, the rain falls for 5.9 days. Throughout January, 0.63" (16mm) of precipitation is accumulated. In Hackettstown, during the entire year, the rain falls for 106.9 days and collects up to 9.84" (250mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Hackettstown, in January, snow falls for 6.4 days, with typically accumulated 0.91" (23mm) of snow. Throughout the year, there are 21.7 snowfall days, and 3.94" (100mm) 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 7:23 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 5:14 pm EST.
Sunshine
In Hackettstown, the average sunshine in January is 4.9h.UV index
In Hackettstown, the average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: During January, 2 as the daily maximum UV index converts into the following advice:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Hackettstown, NJ
- Average high temperature in January: 33.8°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (33.8°F).
- Average low temperature in January: 21°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in January
Hackettstown, 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
Hackettstown, NJ
- Average wind speed in January: 7.8mph
The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in January
Hackettstown, NJ
- Average humidity in January: 78%
The months with the highest relative humidity are February, October and December (81%).
The month with the lowest relative humidity is April (76%).
Average rainfall in January
Hackettstown, NJ
- Average rainfall in January: 0.63"
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
Hackettstown, NJ
- Average rainfall days in January: 5.9 days
The month with the highest number of rainy days is May (12.2 days).
The month with the least rainy days is January (5.9 days).
Average snowfall in January
Hackettstown, NJ
- Average snowfall in January: 0.91"
The month with the highest snowfall is February (0.98").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Hackettstown, NJ
- Average snowfall days in January: 6.4 days
The month with the highest number of snowfall days is February (6.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Hackettstown, NJ
- Average daylight in January: 9h and 36min
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 54min
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 30min).
Average sunshine days in January
Hackettstown, NJ
- Average sunshine days in January: 21.5 days
The month with the most sunshine days is January (21.5 days).
The month with the least sunshine days is May (15.4 days).
Average UV index in January
Hackettstown, NJ
- Average UV index in January: 2
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in January
Hackettstown, NJ
- Average cloud cover in January: 47
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in January
Hackettstown, NJ
- Average visibility in January: 6mi
The months with the highest visibility are January, March, April, November and December (6mi).
The months with the lowest visibility are February, May, June, July, August, September and October (5mi).
