December weather forecastActon, MT
December
Weather in December
The first month of the winter, December, is also a subzero cold month in Acton, Montana, with an average temperature ranging between max 31.1°F (-0.5°C) and min 18.7°F (-7.4°C).Temperature
December brings the lowest temperatures, with an average high of 31.1°F (-0.5°C) and an average low of 18.7°F (-7.4°C).Humidity
The average relative humidity in December in Acton is 74%.Rainfall
In Acton, in December, it is raining for 7.5 days, with typically 0.75" (19mm) of accumulated precipitation. In Acton, during the entire year, the rain falls for 120.5 days and collects up to 13.54" (344mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. In Acton, during December, snow falls for 13.5 days and regularly aggregates up to 5.2" (132mm) of snow. In Acton, during the entire year, snow falls for 68.6 days and aggregates up to 32.56" (827mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 42min of daylight.On the first day of December, sunrise is at 7:36 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:56 am and sunset at 4:39 pm MST.
Sunshine
In Acton, the average sunshine in December is 5.5h.UV index
The months with the lowest UV index in Acton are January through March, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In December, a regular UV index of 2 translates into these guidelines:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Acton, MT
- Average high temperature in December: 31.1°F
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is December (31.1°F).
- Average low temperature in December: 18.7°F
The months with the highest average low temperature are July and August (60.6°F).
The coldest month (with the lowest average low temperature) is February (18.3°F).
Average pressure in December
Acton, MT
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in December
Acton, MT
- Average wind speed in December: 9.5mph
The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).
Average humidity in December
Acton, MT
- Average humidity in December: 74%
The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (40%).
Average rainfall in December
Acton, MT
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is May (2.24").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Acton, MT
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (5.6 days).
Average snowfall in December
Acton, MT
- Average snowfall in December: 5.2"
The month with the highest snowfall is February (6.61").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Acton, MT
- Average snowfall days in December: 13.5 days
The month with the highest number of snowfall days is February (14.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Acton, MT
- Average daylight in December: 8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 5h and 30min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 18min).
Average sunshine days in December
Acton, MT
- Average sunshine days in December: 15.2 days
The month with the most sunshine days is September (21.1 days).
The month with the least sunshine days is April (9.8 days).
Average UV index in December
Acton, MT
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Acton, MT
- Average cloud cover in December: 42
The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 14).
Average visibility in December
Acton, MT
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
