Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
As November transitions into December, Mill River sees a drop in the average high-temperature, transitioning from a frosty 45.5°F (7.5°C) to a cold 34.9°F (1.6°C). During the month of December, the temperature in Mill River generally drops to a low average of 23.9°F (-4.5°C).Humidity
In December, the average relative humidity in Mill River is 83%.Rainfall
In Mill River, in December, it is raining for 11.2 days, with typically 2.87" (73mm) of accumulated precipitation. In Mill River, during the entire year, the rain falls for 157.8 days and collects up to 31.69" (805mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Mill River, in December, snow falls for 10 days, with typically accumulated 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
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:02 am and sunset at 4:22 pm. On the last day of December, in Mill River, sunrise is at 7:21 am and sunset at 4:31 pm EST.
Sunshine
The average sunshine in December in Mill River is 4.3h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the average person.Note: The UV index of 1 in December translates into these instructions:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Frequently asked questions
How cold is it in Mill River in December?
What is the average humidity in December in Mill River?
How much does it rain in Mill River in December?
How many days does it snow in December in Mill River?
What is the month with the shortest days in Mill River?
How many hours of daylight does Mill River have in December?
When are sunrise and sunset in December in Mill River?
How long on average sun shines in December in Mill River?
What is the month with the lowest UV index in Mill River?
How high is the UV index in December in Mill River?
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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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
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