December weather forecast
East Derry, NH

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Weather in December

The first month of the winter, December, is still a cold month in East Derry, New Hampshire, with an average temperature varying between 36.3°F (2.4°C) and 25.3°F (-3.7°C).

Temperature

The onset of December coincides with a reduction in the average high-temperature, falling from a frosty 46.6°F (8.1°C) in November to a wintry 36.3°F (2.4°C). East Derry, during the month of December, experiences an average low-temperature of 25.3°F (-3.7°C).

Humidity

In December, the average relative humidity is 79%.

Rainfall

In East Derry, New Hampshire, in December, it is raining for 6.3 days, with typically 1.1" (28mm) of accumulated precipitation. In East Derry, during the entire year, the rain falls for 104.4 days and collects up to 12.95" (329mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in East Derry. The month with the most snowfall is December, when snow falls for 4 days and typically aggregates up to 2.99" (76mm) of snow.

Daylight

With an average of 9h and 6min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 6:57 am and sunset at 4:11 pm. On the last day of December, sunrise is at 7:16 am and sunset at 4:20 pm EST.

Sunshine

In December, the average sunshine is 4.8h.

UV index

January through March, November and 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 minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The UV index of 2 during December translates into the following guidance:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.

Frequently asked questions

How cold is December?

During December, East Derry experiences an average high-temperature of 36.3°F (2.4°C) and a low-temperature of 25.3°F (-3.7°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines air temperature and relative humidity, in July is evaluated at 86°F (30°C).

What is the average humidity in December?

In December, the average relative humidity is 79%.

How many days does it rain in December?

In East Derry, in December, it is raining for 6.3 days, with typically 1.1" (28mm) of accumulated precipitation.

What is the snowiest month?

December is the month with the most snowfall. Snow falls for 4 days and accumulates 2.99" (76mm) of snow.

How much does it snow in December?

In December, it is snowing for 4 days. Throughout December, 2.99" (76mm) of snow is accumulated.

What is the month with the shortest days?

With an average of 9h and 6min of daylight, December has the shortest days of the year.

How many hours of daylight does East Derry have in December?

The average day length in December is 9h and 5min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 6:57 am and sunset at 4:11 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:20 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 4.8h.

When is the lowest UV index?

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.

What is the UV index reading in December?

In East Derry, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
East Derry, NH

Average temperature in December - East Derry, NH
  • Average high temperature in December: 36.3°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in December: 25.3°F

The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (18°F).

Average pressure in December
East Derry, NH

Average pressure in December - East Derry, NH
  • Average pressure in December: 30.03"Hg

The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in December
East Derry, NH

Average wind speed in December - East Derry, NH
  • Average wind speed in December: 7.8mph

The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in December
East Derry, NH

Average humidity in December - East Derry, 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 (72%).

Average rainfall in December
East Derry, NH

Average rainfall in December - East Derry, NH
  • Average rainfall in December: 1.1"

The wettest month (with the highest rainfall) is October (1.38").
The driest month (with the least rainfall) is January (0.75").

Average rainfall days in December
East Derry, NH

Average rainfall days in December - East Derry, NH
  • Average rainfall days in December: 6.3 days

The month with the highest number of rainy days is June (12.1 days).
The month with the least rainy days is January (4.1 days).

Average snowfall in December
East Derry, NH

Average snowfall in December - East Derry, NH
  • Average snowfall in December: 2.99"

The month with the highest snowfall is December (2.99").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
East Derry, NH

Average snowfall days in December - East Derry, NH
  • Average snowfall days in December: 4 days

The month with the highest number of snowfall days is January (7.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
East Derry, NH

Average daylight in December / Average sunshine in December - East Derry, 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 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

Average sunshine days in December
East Derry, NH

Average sunshine days in December - East Derry, NH
  • Average sunshine days in December: 21.3 days

The months with the most sunshine days are January and December (21.3 days).
The month with the least sunshine days is June (16.7 days).

Average UV index in December
East Derry, NH

Average UV index in December - East Derry, 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
East Derry, NH

Average cloud cover in December - East Derry, NH
  • Average cloud cover in December: 47

The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 33).

Average visibility in December
East Derry, NH

Average visibility in December - East Derry, NH
  • Average visibility in December: 6mi

The months with the highest visibility are January, April, November and December (6mi).
The months with the lowest visibility are February, March, May, June, July, August, September and October (5mi).

East Derry, New Hampshire, USA

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