December weather forecast
Washington, NH

Share

Weather in December

The first month of the winter, December, is still a freezing cold month in Washington, New Hampshire, with an average temperature ranging between max 31.3°F (-0.4°C) and min 21°F (-6.1°C).

Temperature

Onset of December comes with a temperature decline, the average high falling from a cold 42.4°F (5.8°C) in November to a freezing cold 31.3°F (-0.4°C). Washington registers a consistent average low-temperature of 21°F (-6.1°C) during December.

Humidity

In December, the average relative humidity in Washington, New Hampshire, is 83%.

Rainfall

In Washington, in December, during 8.1 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. Throughout the year, there are 121.9 rainfall days, and 13.58" (345mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Washington are January through May, October through December. In Washington, in December, during 11.2 snowfall days, 2.6" (66mm) of snow is typically accumulated. In Washington, during the entire year, snow falls for 65.7 days and aggregates up to 19.88" (505mm) of snow.

Daylight

With an average of 9h and 6min of daylight, December has the shortest days of the year in Washington.
On the first day of the month, sunrise is at 7:01 am and sunset at 4:14 pm. On the last day of December, in Washington, sunrise is at 7:20 am and sunset at 4:23 pm EST.

Sunshine

In December, the average sunshine in Washington, New Hampshire, is 4.2h.

UV index

February and December, with an average maximum UV index of 1, are months with the lowest UV index in Washington. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the average person.
Note: In December, the maximum UV index of 1 suggests this advice:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
[Resources]

Frequently asked questions

How cold is it in Washington in December?

The high-temperature in Washington, New Hampshire, during December is 31.3°F (-0.4°C) and the low-temperature is 21°F (-6.1°C).

What is the average humidity in December in Washington?

In December, the average relative humidity is 83%.

How much does it rain in Washington in December?

In Washington, New Hampshire, in December, during 8.1 rainfall days, 1.02" (26mm) of precipitation is typically accumulated.

How many days does it snow in December in Washington?

In December, it is snowing for 11.2 days. Throughout December, 2.6" (66mm) of snow is accumulated.

What is the month with the shortest days in Washington?

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

What is the average length of the day in December in Washington?

The average day length in December is 9h and 3min.

When are sunrise and sunset in December in Washington?

In December, on the first day of the month, sunrise is at 7:01 am and sunset at 4:14 pm. On the last day of the month, in Washington, New Hampshire, sunrise is at 7:20 am and sunset at 4:23 pm EST.

How many hours of sunshine does Washington have in December?

In December, the average sunshine duration in Washington, New Hampshire, is 4.2h.

When is the lowest UV index in Washington?

February and December, with an average maximum UV index of 1, are months with the lowest UV index in Washington.

How high is the UV index in December in Washington?

The average daily maximum UV index in December in Washington is 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to Sun's UV rays.
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
Washington, NH

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).

[Resources]

Average pressure in December
Washington, NH

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).

[Resources]

Average wind speed in December
Washington, NH

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).

[Resources]

Average humidity in December
Washington, NH

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%).

[Resources]

Average rainfall in December
Washington, NH

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").

[Resources]

Average rainfall days in December
Washington, NH

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).

[Resources]

Average snowfall in December
Washington, NH

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").

[Resources]

Average snowfall days in December
Washington, NH

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).

[Resources]

Average daylight in December /
Average sunshine in December
Washington, NH

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).

[Resources]

Average sunshine days in December
Washington, NH

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).

[Resources]

Average UV index in December
Washington, NH

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).

[Resources]

Average cloud cover in December
Washington, NH

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).

[Resources]

Average visibility in December
Washington, NH

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).

[Resources]

Washington, New Hampshire, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location