December weather forecast
Greenfield, MA

Weather in December

The first month of the winter, December, is still a cold month in Greenfield, Massachusetts, with an average temperature fluctuating between 24.3°F (-4.3°C) and 35.1°F (1.7°C).

Temperature

In Greenfield, the average high-temperature in December decreases from a frosty 45.9°F (7.7°C) in November to a wintry 35.1°F (1.7°C). The average low-temperature, in December, is 24.3°F (-4.3°C).

Humidity

In December, the average relative humidity is 81%.

Rainfall

The wettest months are October and December, with an average 3.03" (77mm) of rainfall.

Snowfall

Months with snowfall in Greenfield, Massachusetts, are January through May, October through December. In Greenfield, Massachusetts, during December, snow falls for 7.5 days and regularly aggregates up to 4.8" (122mm) of snow. In Greenfield, during the entire year, snow falls for 42.1 days and aggregates up to 24.53" (623mm) of snow.

Daylight

With an average of 9h and 7min of daylight, December has the shortest days of the year in Greenfield.
On the first day of the month, sunrise is at 7:00 am and sunset at 4:18 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:26 pm EST.

Sunshine

The average sunshine in December is 5h.

UV index

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Greenfield?

The average high-temperature, in December, is 35.1°F (1.7°C), while the average low-temperature is 24.3°F (-4.3°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, in July is computed to be 86°F (30°C).

What is the average humidity in December in Greenfield?

In December, the average relative humidity in Greenfield, Massachusetts, is 81%.

What is the rainiest month in Greenfield?

The months with the most rainfall in Greenfield, Massachusetts, are October and December, with an average 3.03" (77mm) of precipitation.

How many days does it rain in December in Greenfield?

In Greenfield, Massachusetts, during December, the rain falls for 11.9 days and regularly aggregates up to 3.03" (77mm) of precipitation.

How much does it snow in Greenfield in December?

In Greenfield, in December, during 7.5 snowfall days, 4.8" (122mm) of snow is typically accumulated.

What is the month with the shortest days in Greenfield?

December has the shortest days of the year in Greenfield, Massachusetts, with an average of 9h and 7min of daylight.

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

In December, the average day length in Greenfield is 9h and 7min.

When is the sunrise / sunset in December in Greenfield?

On the first day of December in Greenfield, Massachusetts, sunrise is at 7:00 am and sunset at 4:18 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:26 pm EST.

How many hours of sunshine does Greenfield have in December?

The average sunshine duration in December is 5h.

What is the month with the lowest UV index in Greenfield?

The months with the lowest UV index in Greenfield are January through March, October through December, with an average maximum UV index of 2.

What is the UV index reading in December in Greenfield?

In December, the average daily maximum UV index in Greenfield is 2. A UV Index reading of 2, and below, represents a low health risk from unsafe 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
Greenfield, MA

Average temperature in December - Greenfield, MA
  • Average high temperature in December: 35.1°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (29.5°F).

  • Average low temperature in December: 24.3°F

The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).

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Average pressure in December
Greenfield, MA

Average pressure in December - Greenfield, MA
  • Average pressure in December: 30.05"Hg

The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in December
Greenfield, MA

Average wind speed in December - Greenfield, MA
  • Average wind speed in December: 7.5mph

The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in December
Greenfield, MA

Average humidity in December - Greenfield, MA
  • Average humidity in December: 81%

The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is April (73%).

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Average rainfall in December
Greenfield, MA

Average rainfall in December - Greenfield, MA
  • Average rainfall in December: 3.03"

The wettest months (with the highest rainfall) are October and December (3.03").
The driest month (with the least rainfall) is September (1.93").

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Average rainfall days in December
Greenfield, MA

Average rainfall days in December - Greenfield, MA
  • Average rainfall days in December: 11.9 days

The months with the highest number of rainy days are May and July (16.3 days).
The month with the least rainy days is January (8.4 days).

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Average snowfall in December
Greenfield, MA

Average snowfall in December - Greenfield, MA
  • Average snowfall in December: 4.8"

The month with the highest snowfall is February (7.01").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Greenfield, MA

Average snowfall days in December - Greenfield, MA
  • Average snowfall days in December: 7.5 days

The month with the highest number of snowfall days is February (10.4 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
Greenfield, MA

Average daylight in December / Average sunshine in December - Greenfield, MA
  • Average daylight in December: 9h and 7min

The month with the longest days is June (Average daylight: 15h and 16min).
The month with the shortest days is December (Average daylight: 9h and 7min).

  • Average sunshine in December: 5h and 0min

The months with the most sunshine are July and August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

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Average sunshine days in December
Greenfield, MA

Average sunshine days in December - Greenfield, MA
  • Average sunshine days in December: 15.2 days

The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is June (10.8 days).

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Average UV index in December
Greenfield, MA

Average UV index in December - Greenfield, MA
  • Average UV index in December: 2

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).

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Average cloud cover in December
Greenfield, MA

Average cloud cover in December - Greenfield, MA
  • Average cloud cover in December: 46

The months with the most cloud cover are February and March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 34).

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Average visibility in December
Greenfield, MA

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

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

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