December weather forecastHeart Butte, MT
December
Weather in December
The first month of the winter, December, is also a subzero cold month in Heart Butte, Montana, with temperature in the range of an average low of 15.3°F (-9.3°C) and an average high of 27.1°F (-2.7°C).Temperature
Heart Butte's December weather, marked by an average high temperature of 27.1°F (-2.7°C) and an average low temperature of 15.3°F (-9.3°C), is the coldest in the year.Humidity
In Heart Butte, the average relative humidity in December is 77%.Rainfall
In Heart Butte, Montana, in December, during 3.5 rainfall days, 0.43" (11mm) of precipitation is typically accumulated. In Heart Butte, during the entire year, the rain falls for 70.4 days and collects up to 8.46" (215mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. In Heart Butte, during December, snow falls for 10.2 days and regularly aggregates up to 2.72" (69mm) of snow. In Heart Butte, during the entire year, snow falls for 54.3 days and aggregates up to 19.49" (495mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 24min of daylight.On the first day of December, sunrise is at 8:02 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 8:22 am and sunset at 4:47 pm MST.
Sunshine
The months with the least sunshine are January and December, with an average of 5.6h of sunshine.UV index
The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the average person.Note: In December, the maximum UV index of 2 translates into these guidelines:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. 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. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Heart Butte, MT
- Average high temperature in December: 27.1°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is December (27.1°F).
- Average low temperature in December: 15.3°F
The month with the highest average low temperature is August (55.2°F).
The coldest month (with the lowest average low temperature) is December (15.3°F).
Average pressure in December
Heart Butte, MT
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in December
Heart Butte, MT
- Average wind speed in December: 11.4mph
The windiest month (with the highest average wind speed) is January (11.8mph).
The calmest months (with the lowest average wind speed) are July and August (8.8mph).
Average humidity in December
Heart Butte, MT
- Average humidity in December: 77%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (43%).
Average rainfall in December
Heart Butte, MT
- Average rainfall in December: 0.43"
The wettest month (with the highest rainfall) is June (1.77").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in December
Heart Butte, MT
- Average rainfall days in December: 3.5 days
The month with the highest number of rainy days is May (10.4 days).
The month with the least rainy days is November (2.6 days).
Average snowfall in December
Heart Butte, MT
- Average snowfall in December: 2.72"
The month with the highest snowfall is February (3.58").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Heart Butte, MT
- Average snowfall days in December: 10.2 days
The month with the highest number of snowfall days is December (10.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Heart Butte, MT
- Average daylight in December: 8h and 24min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in December: 5h and 36min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).
Average sunshine days in December
Heart Butte, MT
- Average sunshine days in December: 19.5 days
The month with the most sunshine days is July (23.5 days).
The month with the least sunshine days is April (17.4 days).
Average UV index in December
Heart Butte, MT
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in December
Heart Butte, MT
- Average cloud cover in December: 40
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 15).
Average visibility in December
Heart Butte, 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).
