December weather forecast
Mendon, MA

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Weather in December

December, the first month of the winter in Mendon, is also a wintry month, with an average temperature ranging between min 27.3°F (-2.6°C) and max 38.3°F (3.5°C).

Temperature

The onset of December comes with a shift in the average high-temperature, falling from a chilly 48.7°F (9.3°C) in November to an icy 38.3°F (3.5°C). Nighttime temperatures hover around an average low of 27.3°F (-2.6°C) in December.

Humidity

The average relative humidity in December is 78%.

Rainfall

December is the month with the most rainfall. Rain falls for 10.3 days and accumulates 3.15" (80mm) of precipitation.

Snowfall

Months with snowfall are January through May, November and December. In December, it is snowing for 5 days. Throughout December, 3.03" (77mm) of snow is accumulated. In Mendon, during the entire year, snow falls for 32.5 days and aggregates up to 18.78" (477mm) of snow.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 6:55 am and sunset at 4:15 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 4:24 pm EST.

Sunshine

In Mendon, the average sunshine in December 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 in Mendon, Massachusetts. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index, 2 during December, leads to the following recommendations:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.

Frequently asked questions

How cold is it in December?

During December, Mendon experiences an average high-temperature of 38.3°F (3.5°C) and a low-temperature of 27.3°F (-2.6°C). In July, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is appraised at 87.8°F (31°C).

What is the average humidity in December?

The average relative humidity in December is 78%.

What is the wettest month in Mendon?

December is the month with the most rainfall. Rain falls for 10.3 days and accumulates 3.15" (80mm) of precipitation.

How many days does it rain in December?

In Mendon, Massachusetts, in December, it is raining for 10.3 days, with typically 3.15" (80mm) of accumulated precipitation.

How many days does it snow in December?

In Mendon, in December, during 5 snowfall days, 3.03" (77mm) of snow is typically accumulated.

What is the month with the shortest days?

With an average of 9h and 12min of daylight, December has the shortest days of the year.

How many hours of daylight does Mendon have in December?

In December, the average day length is 9h and 10min.

What time are sunrise and sunset in December in Mendon?

In December, on the first day of the month, sunrise is at 6:55 am and sunset at 4:15 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 4:24 pm EST.

How many hours of sunshine does Mendon have in December?

In December, the average sunshine duration is 4.8h.

What is the month with the lowest UV index?

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

What is the UV index reading in December?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability 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
Mendon, MA

Average temperature in December - Mendon, MA
  • Average high temperature in December: 38.3°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 (32.5°F).

  • Average low temperature in December: 27.3°F

The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).

Average pressure in December
Mendon, MA

Average pressure in December - Mendon, MA
  • 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 (29.93"Hg).

Average wind speed in December
Mendon, MA

Average wind speed in December - Mendon, MA
  • Average wind speed in December: 8.5mph

The windiest months (with the highest average wind speed) are January, February and March (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

Average humidity in December
Mendon, MA

Average humidity in December - Mendon, MA
  • Average humidity in December: 78%

The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is April (71%).

Average rainfall in December
Mendon, MA

Average rainfall in December - Mendon, MA
  • Average rainfall in December: 3.15"

The wettest month (with the highest rainfall) is December (3.15").
The driest month (with the least rainfall) is September (1.54").

Average rainfall days in December
Mendon, MA

Average rainfall days in December - Mendon, MA
  • Average rainfall days in December: 10.3 days

The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is January (7.7 days).

Average snowfall in December
Mendon, MA

Average snowfall in December - Mendon, MA
  • Average snowfall in December: 3.03"

The month with the highest snowfall is March (4.92").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Mendon, MA

Average snowfall days in December - Mendon, MA
  • Average snowfall days in December: 5 days

The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Mendon, MA

Average daylight in December / Average sunshine in December - Mendon, MA
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

Average sunshine days in December
Mendon, MA

Average sunshine days in December - Mendon, MA
  • Average sunshine days in December: 16.5 days

The month with the most sunshine days is November (18 days).
The month with the least sunshine days is July (11.8 days).

Average UV index in December
Mendon, MA

Average UV index in December - Mendon, MA
  • 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
Mendon, MA

Average cloud cover in December - Mendon, MA
  • 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 36).

Average visibility in December
Mendon, MA

Average visibility in December - Mendon, MA
  • Average visibility in December: 6mi

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

Mendon, Massachusetts, USA

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