December weather forecastSphinx, MT
December
Weather in December
The first month of the winter, December, is also a subzero cold month in Sphinx, Montana, with an average temperature fluctuating between 22.5°F (-5.3°C) and 7.9°F (-13.4°C).Temperature
The month of December sees the lowest average temperatures, reaching 22.5°F (-5.3°C) at the peak and 7.9°F (-13.4°C) at the low.Humidity
The average relative humidity in December is 89%.Rainfall
In Sphinx, in December, during 6.3 rainfall days, 1.34" (34mm) of precipitation is typically accumulated. In Sphinx, Montana, during the entire year, the rain falls for 116.1 days and collects up to 23.5" (597mm) of precipitation.Snowfall
Months with snowfall in Sphinx are January through December. In Sphinx, during December, snow falls for 19.1 days and regularly aggregates up to 11.1" (282mm) of snow. In Sphinx, during the entire year, snow falls for 151.6 days and aggregates up to 124.06" (3151mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 48min of daylight.On the first day of the month, sunrise is at 7:42 am and sunset at 4:42 pm. On the last day of December, sunrise is at 8:02 am and sunset at 4:51 pm MST.
Sunshine
In Sphinx, the average sunshine in December is 4.8h.UV index
In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 2 during December translates into the following recommendations:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sphinx, MT
- Average high temperature in December: 22.5°F
The warmest month (with the highest average high temperature) is July (74.8°F).
The month with the lowest average high temperature is December (22.5°F).
- Average low temperature in December: 7.9°F
The month with the highest average low temperature is August (45.1°F).
The coldest month (with the lowest average low temperature) is December (7.9°F).
Average pressure in December
Sphinx, MT
- Average pressure in December: 30.21"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Sphinx, MT
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is January (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Sphinx, MT
- Average humidity in December: 89%
The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is August (51%).
Average rainfall in December
Sphinx, MT
- Average rainfall in December: 1.34"
The wettest months (with the highest rainfall) are April and May (2.91").
The driest month (with the least rainfall) is July (1.18").
Average rainfall days in December
Sphinx, MT
- Average rainfall days in December: 6.3 days
The month with the highest number of rainy days is June (16.6 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in December
Sphinx, MT
- Average snowfall in December: 11.1"
The month with the highest snowfall is April (19.88").
The month with the least snowfall is August (0.08").
Average snowfall days in December
Sphinx, MT
- Average snowfall days in December: 19.1 days
The month with the highest number of snowfall days is March (21 days).
The month with the least snowfall days is August (0.3 days).
Average daylight in December /
Average sunshine in December
Sphinx, MT
- Average daylight in December: 8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 4h and 48min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in December
Sphinx, MT
- Average sunshine days in December: 12.2 days
The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is May (5.7 days).
Average UV index in December
Sphinx, MT
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January and February (UV index 1).
Average cloud cover in December
Sphinx, MT
- Average cloud cover in December: 56
The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 17).
Average visibility in December
Sphinx, MT
- Average visibility in December: 4mi
The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
