December weather forecastMill Iron, MT
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Mill Iron, Montana, with an average temperature ranging between min 14.9°F (-9.5°C) and max 26.6°F (-3°C).Temperature
Mill Iron's December weather features a mild decline in high-temperatures, reducing from an icy 40.1°F (4.5°C) in November to a subzero cold 26.6°F (-3°C). In the month of December, Mill Iron witnesses a consistent average low-temperature of 14.9°F (-9.5°C).Humidity
In Mill Iron, the average relative humidity in December is 82%.Rainfall
The months with the least rainfall are January and December Rain falls for 3.5 days and accumulates 0.55" (14mm) of rain.Snowfall
Months with snowfall are January through May, September through December. In December, it is snowing for 11.3 days. Throughout December, 3.35" (85mm) of snow is accumulated. Throughout the year, there are 62.4 snowfall days, and 21.97" (558mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:18 am and sunset at 4:13 pm. On the last day of December, sunrise is at 7:38 am and sunset at 4:22 pm MST.
Sunshine
The months with the least sunshine in Mill Iron are February and December, with an average of 4.8h of sunshine.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index of 1 during December translates into the following directions:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mill Iron, MT
- Average high temperature in December: 26.6°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in December: 14.9°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 (13.3°F).
Average pressure in December
Mill Iron, MT
- Average pressure in December: 30.14"Hg
The months with the highest atmospheric pressure are January and February (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in December
Mill Iron, MT
- Average wind speed in December: 11.4mph
The windiest months (with the highest average wind speed) are April and October (11.9mph).
The calmest months (with the lowest average wind speed) are July and August (10.1mph).
Average humidity in December
Mill Iron, MT
- Average humidity in December: 82%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (46%).
Average rainfall in December
Mill Iron, MT
- Average rainfall in December: 0.55"
The wettest month (with the highest rainfall) is May (2.6").
The driest months (with the least rainfall) are January and December (0.55").
Average rainfall days in December
Mill Iron, MT
- Average rainfall days in December: 3.5 days
The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is January (3.1 days).
Average snowfall in December
Mill Iron, MT
- Average snowfall in December: 3.35"
The month with the highest snowfall is February (3.86").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Mill Iron, MT
- Average snowfall days in December: 11.3 days
The month with the highest number of snowfall days is February (12 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Mill Iron, 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: 4h and 48min
The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).
Average sunshine days in December
Mill Iron, MT
- Average sunshine days in December: 17.7 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (11.9 days).
Average UV index in December
Mill Iron, MT
- Average UV index in December: 1
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Mill Iron, MT
- Average cloud cover in December: 50
The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility in December
Mill Iron, 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).
