Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
January and December, when the average high-temperature reaches 27.1°F (-2.7°C), are the coldest months.Humidity
In December, the average relative humidity is 80%.Rainfall
The month with the least rainfall is December, when the rain falls for 4.4 days and typically collects 0.31" (8mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. In Saint Johns, during December, snow falls for 10.5 days and regularly aggregates up to 1.97" (50mm) of snow. In Saint Johns, during the entire year, snow falls for 53.5 days and aggregates up to 14.25" (362mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 18min of daylight.On the first day of the month, sunrise is at 7:52 am and sunset at 4:25 pm. On the last day of December, sunrise is at 8:13 am and sunset at 4:33 pm MST.
Sunshine
In Saint Johns, the average sunshine in December is 5.4h.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 of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum daily UV index of 2 during December morphs into the following directions:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest?
How cold is December?
What is the average humidity in December?
What is the driest month?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Saint Johns have in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index in Saint Johns?
What is the UV index intensity in December?
Average temperature in December
Saint Johns, MT
- Average high temperature in December: 27.1°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The months with the lowest average high temperature are January and December (27.1°F).
- Average low temperature in December: 15.4°F
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is February (13.5°F).
Average pressure in December
Saint Johns, MT
- Average pressure in December: 30.11"Hg
The months with the highest atmospheric pressure are January and February (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in December
Saint Johns, MT
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (8.5mph).
Average humidity in December
Saint Johns, MT
- Average humidity in December: 80%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is August (40%).
Average rainfall in December
Saint Johns, MT
- Average rainfall in December: 0.31"
The wettest month (with the highest rainfall) is June (1.5").
The driest month (with the least rainfall) is December (0.31").
Average rainfall days in December
Saint Johns, MT
- Average rainfall days in December: 4.4 days
The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is February (4 days).
Average snowfall in December
Saint Johns, MT
- Average snowfall in December: 1.97"
The month with the highest snowfall is February (2.72").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Saint Johns, MT
- Average snowfall days in December: 10.5 days
The month with the highest number of snowfall days is February (11 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Saint Johns, MT
- Average daylight in December: 8h and 2min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in December: 5h and 2min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 18min).
Average sunshine days in December
Saint Johns, MT
- Average sunshine days in December: 18.7 days
The month with the most sunshine days is September (20.3 days).
The month with the least sunshine days is April (12.8 days).
Average UV index in December
Saint Johns, 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
Saint Johns, MT
- Average cloud cover in December: 43
The month with the most cloud cover is February (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 16).
Average visibility in December
Saint Johns, 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).
Saint Johns, Montana, USA
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