December weather forecast
Derry, NH

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Weather in December

December in Derry ushers in the winter plenitude, with below-freezing temperatures becoming a norm and snowfall increasing. December's most significant weather aspect is its snowfall, seeing about 2.99" (76mm), making recreational snow activities popular. Despite the chilliness and increased cloud cover, the month is imbued with festive cheer due to Christmas and New Year celebrations, serving hot cocoa, warm fires, and holiday lights against a snow-dusted backdrop.

Temperature

The start of December involves a temperature drop, moving from a chilly 46.6°F (8.1°C) in November to an icy 36.3°F (2.4°C). An average minimum temperature of 25.3°F (-3.7°C) is recorded during the month of December.

Humidity

In December, the average relative humidity is 79%.

Rainfall

In Derry, in December, it is raining for 6.3 days, with typically 1.1" (28mm) of accumulated precipitation. Throughout the year, there are 104.4 rainfall days, and 12.95" (329mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall in Derry. December is the month with the most snowfall. Snow falls for 4 days and accumulates 2.99" (76mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 6min of daylight.
On the first day of December, sunrise is at 6:57 am and sunset at 4:12 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:21 pm EST.

Sunshine

In Derry, the average sunshine in December is 4.8h.

UV index

The months with the lowest UV index 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 minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, an average UV index of 2 transforms into the following instructions:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Stay sun-safe with clothing that is both closely woven and worn loosely. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Updated: Aug 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The average high-temperature and low-temperature during December are 36.3°F (2.4°C) and 25.3°F (-3.7°C) respectively. In July, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, 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 December, the rain falls for 6.3 days. Throughout December, 1.1" (28mm) of precipitation is accumulated.

When does it snow the most?

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

How many days does it snow in December?

In Derry, in December, snow falls for 4 days, with typically accumulated 2.99" (76mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 6min of daylight.

How many hours of daylight does Derry have in December?

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

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 6:57 am and sunset at 4:12 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:21 pm EST.

How many hours of sunshine does Derry have in December?

In December, the average sunshine duration is 4.8h.

What are the months with 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.

How high is the UV index in December?

In 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 exposure to the Sun's 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
Derry, NH

Average temperature in December - 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
Derry, NH

Average pressure in December - 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
Derry, NH

Average wind speed in December - 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
Derry, NH

Average humidity in December - 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
Derry, NH

Average rainfall in December - 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
Derry, NH

Average rainfall days in December - 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
Derry, NH

Average snowfall in December - 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
Derry, NH

Average snowfall days in December - 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
Derry, NH

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

Average sunshine days in December - 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
Derry, NH

Average UV index in December - 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
Derry, NH

Average cloud cover in December - 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
Derry, NH

Average visibility in December - 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).

Derry, New Hampshire, USA

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