December weather forecast
Mill River, MA

Share

Weather in December

The first month of the winter, December, is still a cold month in Mill River, Massachusetts, with an average temperature fluctuating between 23.9°F (-4.5°C) and 34.9°F (1.6°C).

Temperature

The transition into December is accompanied by a temperature decrease, with the average high-temperature shifting from a frosty 45.5°F (7.5°C) in November to a wintry 34.9°F (1.6°C). Mill River experiences a steady low-temperature of 23.9°F (-4.5°C) throughout December.

Humidity

In Mill River, the average relative humidity in December is 83%.

Rainfall

In December, the rain falls for 11.2 days. Throughout December, 2.87" (73mm) of precipitation is accumulated. In Mill River, during the entire year, the rain falls for 157.8 days and collects up to 31.69" (805mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Mill River, during December, snow falls for 10 days and regularly aggregates up to 5.55" (141mm) of snow. In Mill River, during the entire year, snow falls for 55.3 days and aggregates up to 29.17" (741mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 12min of daylight.
On the first day of December, sunrise is at 7:02 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:31 pm EST.

Sunshine

In Mill River, the average sunshine in December is 4.3h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: The UV index of 1 during December translates into the following guidance:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.

Frequently asked questions

How cold is December?

December temperatures vary between a high-temperature of 34.9°F (1.6°C) and a low-temperature of 23.9°F (-4.5°C).

What is the average humidity in December?

The average relative humidity in December is 83%.

How many days does it rain in December in Mill River?

In Mill River, in December, it is raining for 11.2 days, with typically 2.87" (73mm) of accumulated precipitation.

How much does it snow in December?

In December, it is snowing for 10 days. Throughout December, 5.55" (141mm) of snow is 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.

What is the average length of the day in December in Mill River?

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

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:02 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:31 pm EST.

How many hours of sunshine does Mill River have in December?

In Mill River, the average sunshine duration in December is 4.3h.

What is the month with the lowest UV index?

With an average maximum UV index of 1, December is the month with the lowest UV index.

What is the UV index reading in December?

In December, the average daily maximum UV index is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability 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
Mill River, MA

Average temperature in December - Mill River, MA
  • Average high temperature in December: 34.9°F

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (29.1°F).

  • Average low temperature in December: 23.9°F

The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

Average pressure in December
Mill River, MA

Average pressure in December - Mill River, MA
  • Average pressure in December: 30.06"Hg

The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Mill River, MA

Average wind speed in December - Mill River, MA
  • Average wind speed in December: 8mph

The windiest months (with the highest average wind speed) are January and March (8.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).

Average humidity in December
Mill River, MA

Average humidity in December - Mill River, MA
  • Average humidity in December: 83%

The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is April (75%).

Average rainfall in December
Mill River, MA

Average rainfall in December - Mill River, MA
  • Average rainfall in December: 2.87"

The wettest month (with the highest rainfall) is October (3.03").
The driest month (with the least rainfall) is January (2.13").

Average rainfall days in December
Mill River, MA

Average rainfall days in December - Mill River, MA
  • Average rainfall days in December: 11.2 days

The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is January (8.2 days).

Average snowfall in December
Mill River, MA

Average snowfall in December - Mill River, MA
  • Average snowfall in December: 5.55"

The month with the highest snowfall is February (6.89").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Mill River, MA

Average snowfall days in December - Mill River, MA
  • Average snowfall days in December: 10 days

The month with the highest number of snowfall days is February (13.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Mill River, MA

Average daylight in December / Average sunshine in December - Mill River, 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 2min

The months with the most sunshine are July and August (Average sunshine: 10h and 0min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).

Average sunshine days in December
Mill River, MA

Average sunshine days in December - Mill River, MA
  • Average sunshine days in December: 13.4 days

The months with the most sunshine days are September and November (15.5 days).
The month with the least sunshine days is February (11.1 days).

Average UV index in December
Mill River, MA

Average UV index in December - Mill River, MA
  • Average UV index in December: 1

The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Mill River, MA

Average cloud cover in December - Mill River, MA
  • Average cloud cover in December: 55

The month with the most cloud cover is February (Cloud cover 57).
The months with the least cloud cover are July and August (Cloud cover 37).

Average visibility in December
Mill River, MA

Average visibility in December - Mill River, MA
  • Average visibility in December: 5mi

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

Mill River, Massachusetts, USA

Weather forecast for your location

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