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
Sullivan's weather changes with the onset of December, slightly falling from a chilly 44.4°F (6.9°C) in November to a wintry 33.4°F (0.8°C). December nights in Sullivan experience a consistent temperature drop to a subzero cold 22.8°F (-5.1°C).Humidity
The average relative humidity in December is 82%.Rainfall
In Sullivan, in December, it is raining for 7.7 days, with typically 0.87" (22mm) of accumulated precipitation. In Sullivan, during the entire year, the rain falls for 125.1 days and collects up to 11.69" (297mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In December, it is snowing for 7.4 days. Throughout December, 1.61" (41mm) of snow is accumulated. Throughout the year, in Sullivan, there are 39.8 snowfall days, and 10.2" (259mm) of snow is accumulated.Daylight
December has the shortest days of the year in Sullivan, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:01 am and sunset at 4:15 pm. On the last day of December, in Sullivan, sunrise is at 7:20 am and sunset at 4:24 pm EST.
Sunshine
In Sullivan, the average sunshine in December is 4.8h.UV index
January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 2 in December translates into this advice:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Frequently asked questions
How cold is December in Sullivan?
What is the average humidity in December in Sullivan?
How much does it rain in Sullivan in December?
How many days does it snow in December in Sullivan?
What is the month with the shortest days in Sullivan?
How many hours of daylight does Sullivan have in December?
When are sunrise and sunset in December in Sullivan?
How many hours of sunshine does Sullivan have in December?
When is the lowest UV index in Sullivan?
What is the UV index reading in December in Sullivan?
Average temperature in December
Sullivan, NH
- Average high temperature in December: 33.4°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in December: 22.8°F
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in December
Sullivan, NH
- Average pressure in December: 30.04"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Sullivan, NH
- Average wind speed in December: 7.3mph
The windiest months (with the highest average wind speed) are January, February and March (7.9mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in December
Sullivan, NH
- Average humidity in December: 82%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is April (74%).
Average rainfall in December
Sullivan, NH
- Average rainfall in December: 0.87"
The wettest month (with the highest rainfall) is July (1.3").
The driest month (with the least rainfall) is March (0.75").
Average rainfall days in December
Sullivan, NH
- Average rainfall days in December: 7.7 days
The month with the highest number of rainy days is May (14.6 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in December
Sullivan, NH
- Average snowfall in December: 1.61"
The month with the highest snowfall is January (2.64").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Sullivan, NH
- Average snowfall days in December: 7.4 days
The month with the highest number of snowfall days is February (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Sullivan, NH
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in December
Sullivan, NH
- Average sunshine days in December: 18.4 days
The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (13.8 days).
Average UV index in December
Sullivan, NH
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in December
Sullivan, NH
- Average cloud cover in December: 49
The months with the most cloud cover are February and March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in December
Sullivan, NH
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
Sullivan, New Hampshire, USA
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