December weather forecastRiverside, MT
December
Weather in December
December, the first month of the winter in Riverside, is also a subzero cold month, with an average temperature varying between 20.1°F (-6.6°C) and 4.8°F (-15.1°C).Temperature
The coldest period is December, when temperatures fluctuate between an average high of 20.1°F (-6.6°C) and a low of 4.8°F (-15.1°C).Humidity
The average relative humidity in December is 93%.Rainfall
In December, in Riverside, the rain falls for 4 days. Throughout December, 1.97" (50mm) of precipitation is accumulated. Throughout the year, there are 109.2 rainfall days, and 23.15" (588mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through July, September through December. In Riverside, during December, snow falls for 23.5 days and regularly aggregates up to 16.38" (416mm) of snow. In Riverside, during the entire year, snow falls for 159.3 days and aggregates up to 120.47" (3060mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 54min of daylight.On the first day of December, sunrise is at 7:41 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 8:01 am and sunset at 4:54 pm MST.
Sunshine
January, February and December, with an average of 3.3h of sunshine, are months with the least sunshine in Riverside.UV index
The months with the lowest UV index are January through April, October through December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, the maximum UV index of 1 transforms into these recommendations:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. During bright days, sunglasses that offer UVA and UVB defense are recommended. 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
Riverside, MT
- Average high temperature in December: 20.1°F
The warmest month (with the highest average high temperature) is July (72.9°F).
The month with the lowest average high temperature is December (20.1°F).
- Average low temperature in December: 4.8°F
The month with the highest average low temperature is August (43.7°F).
The coldest month (with the lowest average low temperature) is December (4.8°F).
Average pressure in December
Riverside, MT
- Average pressure in December: 30.23"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Riverside, MT
- Average wind speed in December: 6.2mph
The windiest month (with the highest average wind speed) is June (6.8mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in December
Riverside, MT
- Average humidity in December: 93%
The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is August (50%).
Average rainfall in December
Riverside, MT
- Average rainfall in December: 1.97"
The wettest month (with the highest rainfall) is May (2.8").
The driest month (with the least rainfall) is July (0.91").
Average rainfall days in December
Riverside, MT
- Average rainfall days in December: 4 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (2.2 days).
Average snowfall in December
Riverside, MT
- Average snowfall in December: 16.38"
The month with the highest snowfall is February (17.83").
The month with the least snowfall is August (0").
Average snowfall days in December
Riverside, MT
- Average snowfall days in December: 23.5 days
The month with the highest number of snowfall days is March (24.4 days).
The months with the least snowfall days are July and August (0.2 days).
Average daylight in December /
Average sunshine in December
Riverside, MT
- Average daylight in December: 8h and 54min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 3h and 18min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 18min).
Average sunshine days in December
Riverside, MT
- Average sunshine days in December: 8.2 days
The months with the most sunshine days are July and September (14.7 days).
The month with the least sunshine days is February (5.3 days).
Average UV index in December
Riverside, MT
- Average UV index in December: 1
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).
Average cloud cover in December
Riverside, MT
- Average cloud cover in December: 72
The month with the most cloud cover is February (Cloud cover 76).
The month with the least cloud cover is July (Cloud cover 16).
Average visibility in December
Riverside, MT
- Average visibility in December: 3mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March and December (3mi).
