January weather forecastWilliamstown, NJ
January
Weather in January
January, the same as December, is an icy winter month in Williamstown, New Jersey, with an average temperature varying between 38.1°F (3.4°C) and 26.8°F (-2.9°C).Temperature
January, with its high-temperature average of 38.1°F (3.4°C) and a low-temperature average of 26.8°F (-2.9°C), is the coldest month.Humidity
In January, the average relative humidity in Williamstown is 74%.Rainfall
In January, in Williamstown, the rain falls for 8.8 days. Throughout January, 2.09" (53mm) of precipitation is accumulated. Throughout the year, in Williamstown, there are 154.9 rainfall days, and 30.47" (774mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, November and December. In January, in Williamstown, New Jersey, it is snowing for 5.5 days. Throughout January, 2.4" (61mm) of snow is accumulated. In Williamstown, during the entire year, snow falls for 17.8 days and aggregates up to 10.28" (261mm) of snow.Daylight
In January, the average length of the day in Williamstown is 9h and 44min.On the first day of the month, sunrise is at 7:20 am and sunset at 4:46 pm. On the last day of January, sunrise is at 7:08 am and sunset at 5:17 pm EST.
Sunshine
In January, the average sunshine is 5.1h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the ordinary person.Note: In January, the average maximum UV index of 2 translates into the following recommendations:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Williamstown, NJ
- Average high temperature in January: 38.1°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (38.1°F).
- Average low temperature in January: 26.8°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).
Average pressure in January
Williamstown, NJ
- Average pressure in January: 30.09"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in January
Williamstown, NJ
- Average wind speed in January: 8.4mph
The windiest month (with the highest average wind speed) is April (8.7mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in January
Williamstown, NJ
- Average humidity in January: 74%
The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (71%).
Average rainfall in January
Williamstown, NJ
- Average rainfall in January: 2.09"
The wettest month (with the highest rainfall) is December (3.35").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days in January
Williamstown, NJ
- Average rainfall days in January: 8.8 days
The month with the highest number of rainy days is July (16.9 days).
The month with the least rainy days is January (8.8 days).
Average snowfall in January
Williamstown, NJ
- Average snowfall in January: 2.4"
The month with the highest snowfall is March (3.54").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in January
Williamstown, NJ
- Average snowfall days in January: 5.5 days
The month with the highest number of snowfall days is January (5.5 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
Williamstown, NJ
- Average daylight in January: 9h and 42min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January: 5h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in January
Williamstown, NJ
- Average sunshine days in January: 18.2 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (11.8 days).
Average UV index in January
Williamstown, 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, November and December (UV index 2).
Average cloud cover in January
Williamstown, NJ
- Average cloud cover in January: 44
The months with the most cloud cover are February and March (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility in January
Williamstown, 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).
