Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
In December, the average high-temperature decreases from an icy 38.8°F (3.8°C) in November to a subzero cold 28°F (-2.2°C). The temperature in Jefferson, New Hampshire, dips to an average of 17.6°F (-8°C) during December nights.Humidity
The average relative humidity in December is 86%.Rainfall
In Jefferson, in December, it is raining for 9 days, with typically 2.76" (70mm) of accumulated precipitation. In Jefferson, during the entire year, the rain falls for 159.6 days and collects up to 31.97" (812mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In December, in Jefferson, New Hampshire, it is snowing for 20.4 days. Throughout December, 9.65" (245mm) of snow is accumulated. Throughout the year, there are 109.1 snowfall days, and 71.5" (1816mm) of snow is accumulated.Daylight
The month with the shortest days in Jefferson, New Hampshire, is December, with an average of 8h and 54min of daylight.On the first day of the month, sunrise is at 7:02 am and sunset at 4:07 pm. On the last day of December, in Jefferson, sunrise is at 7:21 am and sunset at 4:16 pm EST.
Sunshine
In Jefferson, the average sunshine in December is 3.1h.UV index
The months with the lowest UV index in Jefferson are January, February and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.Note: A maximum UV index of 1 in December translates into the following recommendations:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Frequently asked questions
How cold is December in Jefferson?
What is the average humidity in December in Jefferson?
How many days does it rain in December in Jefferson?
How many days does it snow in December in Jefferson?
What is the month with the shortest days in Jefferson?
What is the average length of the day in December in Jefferson?
When is the sunrise / sunset in December in Jefferson?
How many hours of sunshine does Jefferson have in December?
What are the months with the lowest UV index in Jefferson?
What is the UV index reading in December in Jefferson?
Average temperature in December
Jefferson, NH
- Average high temperature in December: 28°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 December: 17.6°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 December
Jefferson, NH
- Average pressure in December: 30.03"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 December
Jefferson, NH
- Average wind speed in December: 5.9mph
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 December
Jefferson, NH
- Average humidity in December: 86%
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 December
Jefferson, NH
- Average rainfall in December: 2.76"
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 December
Jefferson, NH
- Average rainfall days in December: 9 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 December
Jefferson, NH
- Average snowfall in December: 9.65"
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 December
Jefferson, NH
- Average snowfall days in December: 20.4 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 December /
Average sunshine in December
Jefferson, NH
- Average daylight in December: 8h and 5min
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 December: 3h and 1min
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 December
Jefferson, NH
- Average sunshine days in December: 7.5 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 December
Jefferson, NH
- Average UV index in December: 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 December
Jefferson, NH
- Average cloud cover in December: 71
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 December
Jefferson, NH
- Average visibility in December: 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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