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
During the transition into December, Sandown observes a decrease in the average high-temperature, falling from a chilly 47.1°F (8.4°C) in November to an icy 36.5°F (2.5°C). Sandown observes an average low-temperature of 26.2°F (-3.2°C) during December nights.Humidity
In December, the average relative humidity in Sandown is 79%.Rainfall
December is the month with the most rainfall. Rain falls for 9.5 days and accumulates 2.99" (76mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In December, it is snowing for 6.4 days. Throughout December, 5.59" (142mm) of snow is accumulated. In Sandown, New Hampshire, during the entire year, snow falls for 37 days and aggregates up to 24.88" (632mm) of snow.Daylight
December has the shortest days of the year in Sandown, with an average of 9h and 6min of daylight.On the first day of December in Sandown, sunrise is at 6:56 am and sunset at 4:11 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 4:20 pm EST.
Sunshine
In December, the average sunshine is 4.7h.UV index
The months with the lowest UV index in Sandown are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the ordinary person.Note: In December, the maximum UV index of 2 transforms into these recommendations:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Sandown in December?
What is the average humidity in December in Sandown?
What is the wettest month in Sandown?
How much does it rain in Sandown in December?
How much does it snow in Sandown in December?
What is the month with the shortest days in Sandown?
How many hours of daylight does Sandown have in December?
What time are sunrise and sunset in December in Sandown?
How many hours of sunshine does Sandown have in December?
When is the lowest UV index in Sandown?
What is the UV index reading in December in Sandown?
Average temperature in December
Sandown, NH
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (31.3°F).
- Average low temperature in December: 26.2°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in December
Sandown, 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 (29.92"Hg).
Average wind speed in December
Sandown, NH
- Average wind speed in December: 8.8mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in December
Sandown, NH
- Average humidity in December: 79%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (73%).
Average rainfall in December
Sandown, NH
- Average rainfall in December: 2.99"
The wettest month (with the highest rainfall) is December (2.99").
The driest month (with the least rainfall) is September (1.5").
Average rainfall days in December
Sandown, NH
- Average rainfall days in December: 9.5 days
The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is January (6.4 days).
Average snowfall in December
Sandown, NH
- Average snowfall in December: 5.59"
The month with the highest snowfall is February (5.98").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Sandown, NH
- Average snowfall days in December: 6.4 days
The month with the highest number of snowfall days is January (9.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Sandown, 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 4min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
Sandown, NH
- Average sunshine days in December: 16.4 days
The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is April (13.6 days).
Average UV index in December
Sandown, NH
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Sandown, NH
- Average cloud cover in December: 48
The month with the most cloud cover is March (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in December
Sandown, NH
- Average visibility in December: 6mi
The months with the highest visibility are January, March, April, June, October, November and December (6mi).
The months with the lowest visibility are February, May, July, August and September (5mi).
Sandown, New Hampshire, USA
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