December weather forecast and climate
Mount Washington, NH

Weather in December

December, the first month of the winter, in Mount Washington, is still a freezing cold month, with average temperature varying between 26.8°F (-2.9°C) and 16.7°F (-8.5°C).

Temperature

In Mount Washington, the average high-temperature decreases, from a cold 37.8°F (3.2°C) in November, to a freezing cold 26.8°F (-2.9°C). In December, the average low-temperature is 16.7°F (-8.5°C).

Humidity

The average relative humidity in December is 85%.

Rainfall

In Mount Washington, New Hampshire, during 9.5 rainfall days, 1.54" (39mm) of precipitation is typically accumulated. In Mount Washington, during the entire year, the rain falls for 144.9 days and collects up to 20.08" (510mm) of precipitation.

Snowfall

Months with snowfall in Mount Washington are January through May, October through December. In December, in Mount Washington, it is snowing for 20.3 days. Throughout December, 8.94" (227mm) of snow is accumulated. In Mount Washington, during the entire year, snow falls for 116.2 days, and aggregates up to 68.07" (1729mm) of snow.

Daylight

December has the shortest days of the year, with an average of 8.9h of daylight.

Sunshine

In December, the average sunshine is 3.9h.

UV index

February and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to the UV radiation for ordinary individuals.
Note: The daily maximum UV index of 1 interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in December in Mount Washington?

In Mount Washington, New Hampshire, in December, the average high-temperature is 26.8°F (-2.9°C), and the average low-temperature is 16.7°F (-8.5°C).

What is the average humidity in December in Mount Washington?

The average relative humidity in December in Mount Washington is 85%.

How many days does it rain in December in Mount Washington?

In Mount Washington, New Hampshire, in December, during 9.5 rainfall days, 1.54" (39mm) of precipitation is typically accumulated.

How many days does it snow in December in Mount Washington?

In Mount Washington, in December, during 20.3 snowfall days, 8.94" (227mm) of snow is typically accumulated.

What is the month with the shortest days in Mount Washington?

December has the shortest days of the year in Mount Washington, with an average of 8.9h of daylight.

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

In December, the average length of the day in Mount Washington is 8.9h.

How many hours of sunshine does Mount Washington have in December?

In December, the average sunshine in Mount Washington, New Hampshire, is 3.9h.

What are the months with the lowest UV index in Mount Washington?

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

How high is the UV index in December in Mount Washington?

In December, the average daily maximum UV index in Mount Washington is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in December
Mount Washington, NH

Average temperature in December - Mount Washington, NH
  • Average high temperature in December: 26.8°F

The warmest month (with the highest average high temperature) is July (75°F).
The month with the lowest average high temperature is January (21.7°F).

  • Average low temperature in December: 16.7°F

The month with the highest average low temperature is July (54.7°F).
The coldest month (with the lowest average low temperature) is January (8.4°F).

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Average pressure in December
Mount Washington, NH

Average pressure in December - Mount Washington, NH
  • Average pressure in December: 30.03"

The month with the highest atmospheric pressure is November (30.06").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in December
Mount Washington, NH

Average wind speed in December - Mount Washington, NH
  • Average wind speed in December: 9.3mph

The windiest month (with the highest average wind speed) is February (9.8mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).

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Average humidity in December
Mount Washington, NH

Average humidity in December - Mount Washington, NH
  • Average humidity in December: 85%

The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is May (77%).

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Average rainfall in December
Mount Washington, NH

Average rainfall in December - Mount Washington, NH
  • Average rainfall in December: 1.54"

The wettest month (with the highest rainfall) is April (2.44").
The driest month (with the least rainfall) is September (0.94").

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Average rainfall days in December
Mount Washington, NH

Average rainfall days in December - Mount Washington, NH
  • Average rainfall days in December: 9.5 days

The month with the highest number of rainy days is July (16.7 days).
The month with the least rainy days is November (8 days).

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Average snowfall in December
Mount Washington, NH

Average snowfall in December - Mount Washington, NH
  • Average snowfall in December: 8.94"

The month with the highest snowfall is January (11.42").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Mount Washington, NH

Average snowfall days in December - Mount Washington, NH
  • Average snowfall days in December: 20.3 days

The month with the highest number of snowfall days is January (20.4 days).
Months with the least snowfall days are July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Mount Washington, NH
  • Average daylight in December: 8.9h

The month with the longest days is June (Average daylight: 15.5h).
The month with the shortest days is December (Average daylight: 8.9h).

  • Average sunshine in December: 3.9h

The month with the most sunshine is August (Average sunshine: 9.8h).
The month with the least sunshine is February (Average sunshine: 3.5h).

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Average sunshine days in December
Mount Washington, NH

Average sunshine days in December - Mount Washington, NH
  • Average sunshine days in December: 9.5 days

The month with the most sunshine days is September (16.2 days).
The month with the least sunshine days is February (7.8 days).

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Average UV index in December
Mount Washington, NH

Average UV index in December - Mount Washington, NH
  • Average UV index in December: 1

Months with the highest UV index are June and July (UV index 5).
Months with the lowest UV index are February and December (UV index 1).

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Average cloud cover in December
Mount Washington, NH

Average cloud cover in December - Mount Washington, NH
  • Average cloud cover in December: 62

The month with the most cloud cover is February (Cloud cover 64).
Months with the least cloud cover are July, August and September (Cloud cover 41).

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Average visibility in December
Mount Washington, NH

Average visibility in December - Mount Washington, NH
  • Average visibility in December: 4mi

Months with the highest visibility are May, June and July (5mi).
Months with the lowest visibility are January, February, March, April, August, September, October, November and December (4mi).

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