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
The month of January sees the lowest average temperatures, reaching 33.8°F (1°C) at the peak and 21°F (-6.1°C) at the low.Humidity
In January, the average relative humidity is 78%.Rainfall
In Hackettstown, in January, it is raining for 5.9 days, with typically 0.63" (16mm) of accumulated precipitation. Throughout the year, there are 106.9 rainfall days, and 9.84" (250mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In January, in Hackettstown, it is snowing for 6.4 days. Throughout January, 0.91" (23mm) of snow is accumulated. In Hackettstown, during the entire year, snow falls for 21.7 days and aggregates up to 3.94" (100mm) of snow.Daylight
In Hackettstown, 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, New Jersey, the average sunshine in January is 4.9h.UV index
In January, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily high UV index of 2 in January leads to these guidelines:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Frequently asked questions
What month is the coldest in Hackettstown?
How cold is it in Hackettstown in January?
What is the average humidity in January in Hackettstown?
How much does it rain in Hackettstown in January?
How many days does it snow in January in Hackettstown?
How many hours of daylight does Hackettstown have in January?
What time are sunrise and sunset in January in Hackettstown?
How long on average sun shines in January in Hackettstown?
How high is the UV index in January in Hackettstown?
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 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: 4h and 5min
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).
Hackettstown, New Jersey, USA
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