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
The onset of December results in a decrease in the average high-temperature, receding from a chilly 49.3°F (9.6°C) in November to a wintry 39.7°F (4.3°C). Millis records an average low-temperature of 28.6°F (-1.9°C) throughout the month of December.Humidity
In Millis, the average relative humidity in December is 77%.Rainfall
The wettest months are March, April and December, with an average 2.87" (73mm) of rainfall.Snowfall
Months with snowfall are January through May, October through December. In Millis, in December, during 5.4 snowfall days, 3.74" (95mm) of snow is typically accumulated. In Millis, during the entire year, snow falls for 31.4 days and aggregates up to 17.8" (452mm) of snow.Daylight
The month with the shortest days in Millis is December, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 6:54 am and sunset at 4:14 pm. On the last day of December, sunrise is at 7:13 am and sunset at 4:23 pm EST.
Sunshine
The average sunshine in December in Millis is 5h.UV index
The months with the lowest UV index in Millis are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the average person.Note: The daily maximum UV index of 2 in December interprets into the following advice:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. Around midday, solar radiation is most harmful; hence, exposure should be limited. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Frequently asked questions
Is December cold in Millis?
What is the average humidity in December in Millis?
What is the wettest month in Millis?
How many days does it rain in December in Millis?
How many days does it snow in December in Millis?
What is the month with the shortest days in Millis?
How many hours of daylight does Millis have in December?
When are sunrise and sunset in December in Millis?
How long on average sun shines in December in Millis?
What are the months with the lowest UV index in Millis?
How high is the UV index in December in Millis?
Average temperature in December
Millis, MA
- Average high temperature in December: 39.7°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in December: 28.6°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).
Average pressure in December
Millis, MA
- Average pressure in December: 30.03"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
Millis, MA
- Average wind speed in December: 8.3mph
The windiest months (with the highest average wind speed) are January, February and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in December
Millis, MA
- Average humidity in December: 77%
The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (70%).
Average rainfall in December
Millis, MA
- Average rainfall in December: 2.87"
The wettest months (with the highest rainfall) are March, April and December (2.87").
The driest month (with the least rainfall) is September (1.22").
Average rainfall days in December
Millis, MA
- Average rainfall days in December: 10.4 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is January (7.9 days).
Average snowfall in December
Millis, MA
- Average snowfall in December: 3.74"
The month with the highest snowfall is February (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Millis, MA
- Average snowfall days in December: 5.4 days
The month with the highest number of snowfall days is March (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Millis, 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: 5h and 0min
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 48min).
Average sunshine days in December
Millis, MA
- Average sunshine days in December: 16.1 days
The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is April (12.8 days).
Average UV index in December
Millis, 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
Millis, MA
- Average cloud cover in December: 46
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in December
Millis, MA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, October, November and December (6mi).
The month with the lowest visibility is September (5mi).
Millis, Massachusetts, USA
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