December weather forecast
Nashua, NH

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The arched Main Street Bridge crossing over the iconic Nashua River in New Hampshire
The arched Main Street Bridge crossing over the iconic Nashua River in New Hampshire

Weather in December

Finally, December signifies the full swing of winter weather in Nashua, with an average high temperature of 36.5°F (2.5°C) and a low of 25.7°F (-3.5°C). In addition to the dip in temperatures, the amount of snowfall also experiences a notable increase. Despite the extreme cold and frequent snow showers, the city has a unique charm with glistening landscapes and festive decorations. The wind intensifies, bringing sharp gusts that emphasize the winter chill. Whilst daylight may be scarcer, periods of sunshine provide momentary, albeit welcomed, relief from the winter conditions.

Temperature

A shift in the average high-temperature occurs in December, reducing from a chilly 47.3°F (8.5°C) in November to an icy 36.5°F (2.5°C). Nashua's average low-temperature for the month of December records at a subzero cold 25.7°F (-3.5°C).

Humidity

The average relative humidity in December in Nashua is 79%.

Rainfall

In Nashua, in December, it is raining for 6.1 days, with typically 0.63" (16mm) of accumulated precipitation. Throughout the year, there are 91.2 rainfall days, and 7.24" (184mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. The months with the most snowfall are February and December, with an average 1.26" (32mm) of accumulated snow.

Daylight

The month with the shortest days in Nashua is December, with an average of 9h and 6min of daylight.
On the first day of the month, sunrise is at 6:57 am and sunset at 4:13 pm. On the last day of December, in Nashua, sunrise is at 7:16 am and sunset at 4:22 pm EST.

Sunshine

In Nashua, the average sunshine in December is 4.9h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The UV index of 2 in December translates into these instructions:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
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Frequently asked questions

How cold is December in Nashua?

The average high-temperature, in December, in Nashua, is 36.5°F (2.5°C), while the average low-temperature is 25.7°F (-3.5°C). In July, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines relative humidity and air temperature, is calculated to be 87.8°F (31°C).

What is the average humidity in December in Nashua?

In December, the average relative humidity is 79%.

How much does it rain in Nashua in December?

In Nashua, New Hampshire, in December, during 6.1 rainfall days, 0.63" (16mm) of precipitation is typically accumulated.

When does it snow the most in Nashua?

The months with the most snowfall in Nashua are February and December, with an average 1.26" (32mm) of accumulated snow.

How much does it snow in Nashua in December?

In Nashua, New Hampshire, in December, during 3.8 snowfall days, 1.26" (32mm) of snow is typically accumulated.

What is the month with the shortest days in Nashua?

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

How many hours of daylight does Nashua have in December?

The average day length in December in Nashua is 9h and 6min.

What time are sunrise and sunset in December in Nashua?

In December, on the first day of the month, sunrise is at 6:57 am and sunset at 4:13 pm. On the last day of the month, in Nashua, sunrise is at 7:16 am and sunset at 4:22 pm EST.

How many hours of sunshine does Nashua have in December?

In Nashua, New Hampshire, the average sunshine duration in December is 4.9h.

What are the months with the lowest UV index in Nashua?

The months with the lowest UV index in Nashua are January, February, November and December, with an average maximum UV index of 2.

How high is the UV index in December in Nashua?

In Nashua, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health threat 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
Nashua, NH

Average temperature in December - Nashua, NH
  • Average high temperature in December: 36.5°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (30.9°F).

  • Average low temperature in December: 25.7°F

The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (18°F).

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Average pressure in December
Nashua, NH

Average pressure in December - Nashua, 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 (29.92"Hg).

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Average wind speed in December
Nashua, NH

Average wind speed in December - Nashua, NH
  • Average wind speed in December: 7.6mph

The windiest month (with the highest average wind speed) is January (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

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Average humidity in December
Nashua, NH

Average humidity in December - Nashua, NH
  • Average humidity in December: 79%

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (71%).

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Average rainfall in December
Nashua, NH

Average rainfall in December - Nashua, NH
  • Average rainfall in December: 0.63"

The wettest month (with the highest rainfall) is November (0.79").
The driest month (with the least rainfall) is September (0.28").

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Average rainfall days in December
Nashua, NH

Average rainfall days in December - Nashua, NH
  • Average rainfall days in December: 6.1 days

The month with the highest number of rainy days is June (10.4 days).
The month with the least rainy days is January (3.5 days).

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Average snowfall in December
Nashua, NH

Average snowfall in December - Nashua, NH
  • Average snowfall in December: 1.26"

The months with the highest snowfall are February and December (1.26").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Nashua, NH

Average snowfall days in December - Nashua, NH
  • Average snowfall days in December: 3.8 days

The month with the highest number of snowfall days is February (6.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Nashua, 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).

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Average sunshine days in December
Nashua, NH

Average sunshine days in December - Nashua, NH
  • Average sunshine days in December: 21.8 days

The month with the most sunshine days is January (22.6 days).
The month with the least sunshine days is July (17.3 days).

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Average UV index in December
Nashua, NH

Average UV index in December - Nashua, 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, November and December (UV index 2).

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Average cloud cover in December
Nashua, NH

Average cloud cover in December - Nashua, NH
  • Average cloud cover in December: 47

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 34).

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Average visibility in December
Nashua, NH

Average visibility in December - Nashua, NH
  • Average visibility in December: 6mi

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

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Nashua, New Hampshire, USA

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