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 coldest month is January, with an average high-temperature of 22.5°F (-5.3°C) and an average low-temperature of 9.1°F (-12.7°C).Humidity
January and February, with an average relative humidity of 89%, are the most humid months.Rainfall
In January, the rain falls for 5.7 days. Throughout January, 2.56" (65mm) of precipitation is accumulated. Throughout the year, there are 159.6 rainfall days, and 31.97" (812mm) of precipitation is accumulated.Snowfall
Months with snowfall in Jefferson are January through May, October through December. In January, it is snowing for 21.2 days. Throughout January, 14.41" (366mm) of snow is accumulated. Throughout the year, there are 109.1 snowfall days, and 71.5" (1816mm) of snow is accumulated.Daylight
The average length of the day in January is 9h and 18min.On the first day of the month, sunrise is at 7:21 am and sunset at 4:16 pm. On the last day of January, sunrise is at 7:05 am and sunset at 4:53 pm EST.
Sunshine
The average sunshine in January is 2.9h.UV index
January, February and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 1 during January leads to these instructions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest in Jefferson?
How cold is it in January?
What is the most humid month?
What is the average humidity in January?
How much does it rain in January?
How much does it snow in January?
How many hours of daylight does Jefferson have in January?
When are sunrise and sunset in January?
How long on average sun shines in January?
When is the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Jefferson, NH
- Average high temperature in January: 22.5°F
The warmest month (with the highest average high temperature) is July (74.8°F).
The month with the lowest average high temperature is January (22.5°F).
- Average low temperature in January: 9.1°F
The month with the highest average low temperature is July (53.8°F).
The coldest month (with the lowest average low temperature) is January (9.1°F).
Average pressure in January
Jefferson, NH
- Average pressure in January: 30"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in January
Jefferson, NH
- Average wind speed in January: 6.2mph
The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).
Average humidity in January
Jefferson, NH
- Average humidity in January: 89%
The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is May (77%).
Average rainfall in January
Jefferson, NH
- Average rainfall in January: 2.56"
The wettest month (with the highest rainfall) is April (3.31").
The driest month (with the least rainfall) is September (2.17").
Average rainfall days in January
Jefferson, NH
- Average rainfall days in January: 5.7 days
The month with the highest number of rainy days is June (18.9 days).
The month with the least rainy days is January (5.7 days).
Average snowfall in January
Jefferson, NH
- Average snowfall in January: 14.41"
The month with the highest snowfall is February (14.88").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Jefferson, NH
- Average snowfall days in January: 21.2 days
The month with the highest number of snowfall days is January (21.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Jefferson, NH
- Average daylight in January: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in January: 2h and 5min
The month with the most sunshine is August (Average sunshine: 9h and 30min).
The month with the least sunshine is February (Average sunshine: 2h and 42min).
Average sunshine days in January
Jefferson, NH
- Average sunshine days in January: 8.9 days
The month with the most sunshine days is September (14.1 days).
The month with the least sunshine days is February (7 days).
Average UV index in January
Jefferson, NH
- Average UV index in January: 1
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in January
Jefferson, NH
- Average cloud cover in January: 72
The month with the most cloud cover is February (Cloud cover 74).
The months with the least cloud cover are July and August (Cloud cover 42).
Average visibility in January
Jefferson, NH
- Average visibility in January: 4mi
The months with the highest visibility are May, June and July (5mi).
The months with the lowest visibility are January, February, March, April, August, September, October, November and December (4mi).
Jefferson, New Hampshire, USA
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