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
A subtle decrease in the average high-temperature marks December, falling from November's cold 42.4°F (5.8°C) to a subzero cold 31.3°F (-0.4°C). Washington cools down to an average low-temperature of 21°F (-6.1°C) throughout the month of December.Humidity
In Washington, the average relative humidity in December is 83%.Rainfall
In Washington, during December, the rain falls for 8.1 days and regularly aggregates up to 1.02" (26mm) of precipitation. In Washington, during the entire year, the rain falls for 121.9 days and collects up to 13.58" (345mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Washington, during December, snow falls for 11.2 days and regularly aggregates up to 2.6" (66mm) of snow. In Washington, during the entire year, snow falls for 65.7 days and aggregates up to 19.88" (505mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 6min of daylight.On the first day of December, sunrise is at 7:01 am and sunset at 4:14 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:23 pm EST.
Sunshine
In December, the average sunshine in Washington is 4.2h.UV index
The months with the lowest UV index are February and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for average individuals.Note: In December, a regular UV index of 1 translates into these guidelines:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
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 many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Washington have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Washington, NH
- Average high temperature in December: 31.3°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (25.5°F).
- Average low temperature in December: 21°F
The month with the highest average low temperature is July (58.1°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).
Average pressure in December
Washington, NH
- Average pressure in December: 30.04"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Washington, NH
- Average wind speed in December: 7.3mph
The windiest months (with the highest average wind speed) are January and February (7.8mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Washington, NH
- Average humidity in December: 83%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is April (75%).
Average rainfall in December
Washington, NH
- Average rainfall in December: 1.02"
The wettest month (with the highest rainfall) is October (1.61").
The driest month (with the least rainfall) is January (0.79").
Average rainfall days in December
Washington, NH
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is May (14.4 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in December
Washington, NH
- Average snowfall in December: 2.6"
The month with the highest snowfall is February (3.82").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Washington, NH
- Average snowfall days in December: 11.2 days
The month with the highest number of snowfall days is February (13.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Washington, 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 1min
The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in December
Washington, NH
- Average sunshine days in December: 16.5 days
The month with the most sunshine days is January (17.6 days).
The month with the least sunshine days is April (12.9 days).
Average UV index in December
Washington, NH
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in December
Washington, NH
- Average cloud cover in December: 56
The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility in December
Washington, NH
- Average visibility in December: 5mi
The months with the highest visibility are January, March, April, May, June, July, August, October, November and December (5mi).
The months with the lowest visibility are February and September (4mi).
Washington, New Hampshire, USA
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