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
December
Weather in December
Temperature
With the onset of December, Mount Washington experiences a modest temperature adjustment, with the average high-temperature receding from a cold 37.8°F (3.2°C) in November to a freezing cold 26.8°F (-2.9°C). During the December nights, an average temperature of 16.7°F (-8.5°C) is observed.Humidity
The average relative humidity in December is 85%.Rainfall
In Mount Washington, during December, the rain falls for 9.5 days and regularly aggregates up to 1.54" (39mm) of precipitation. In Mount Washington, during the entire year, the rain falls for 144.9 days and collects up to 20.08" (510mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Mount Washington, New Hampshire, during December, snow falls for 20.3 days and regularly aggregates up to 8.94" (227mm) of snow. Throughout the year, there are 116.2 snowfall days, and 68.07" (1729mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 8h and 54min of daylight.On the first day of the month, sunrise is at 7:01 am and sunset at 4:07 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:16 pm EST.
Sunshine
In December, the average sunshine is 3.9h.UV index
The months with the lowest UV index are February and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: In December, an average UV index of 1 transforms into the following instructions:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days in Mount Washington?
What is the average length of the day in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Mount Washington have in December?
When is the lowest UV index in Mount Washington?
What is the UV index intensity in December?
Average temperature in December
Mount Washington, NH
- Average high temperature in December: 26.8°F
The warmest month (with the highest average high temperature) is July (75°F).
The month with the lowest average high temperature is January (21.7°F).
- Average low temperature in December: 16.7°F
The month with the highest average low temperature is July (54.7°F).
The coldest month (with the lowest average low temperature) is January (8.4°F).
Average pressure in December
Mount Washington, 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
Mount Washington, NH
- Average wind speed in December: 9.3mph
The windiest month (with the highest average wind speed) is February (9.8mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).
Average humidity in December
Mount Washington, NH
- Average humidity in December: 85%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is May (77%).
Average rainfall in December
Mount Washington, NH
- Average rainfall in December: 1.54"
The wettest month (with the highest rainfall) is April (2.44").
The driest month (with the least rainfall) is September (0.94").
Average rainfall days in December
Mount Washington, NH
- Average rainfall days in December: 9.5 days
The month with the highest number of rainy days is July (16.7 days).
The month with the least rainy days is November (8 days).
Average snowfall in December
Mount Washington, NH
- Average snowfall in December: 8.94"
The month with the highest snowfall is January (11.42").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mount Washington, NH
- Average snowfall days in December: 20.3 days
The month with the highest number of snowfall days is January (20.4 days).
The months with the least snowfall days are July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mount Washington, 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 5min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is February (Average sunshine: 3h and 30min).
Average sunshine days in December
Mount Washington, NH
- Average sunshine days in December: 9.5 days
The month with the most sunshine days is September (16.2 days).
The month with the least sunshine days is February (7.8 days).
Average UV index in December
Mount Washington, 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 February and December (UV index 1).
Average cloud cover in December
Mount Washington, NH
- Average cloud cover in December: 62
The month with the most cloud cover is February (Cloud cover 64).
The months with the least cloud cover are July, August and September (Cloud cover 41).
Average visibility in December
Mount Washington, 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).