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
The months of January and December bring the lowest temperatures, averaging a high of 27.1°F (-2.7°C).Humidity
In December, the average relative humidity in Saint Johns is 80%.Rainfall
December is the month with the least rainfall. Rain falls for 4.4 days and accumulates 0.31" (8mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. In December, in Saint Johns, it is snowing for 10.5 days. Throughout December, 1.97" (50mm) of snow is accumulated. In Saint Johns, Montana, during the entire year, snow falls for 53.5 days and aggregates up to 14.25" (362mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 18min of daylight.On the first day of December in Saint Johns, sunrise is at 7:52 am and sunset at 4:25 pm. On the last day of the month, 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
January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: A maximum high daily UV index of 2 during December translates into the following directions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Frequently asked questions
What part of the year is the coldest in Saint Johns?
How cold is December in Saint Johns?
What is the average humidity in December in Saint Johns?
What is the driest month in Saint Johns?
How many days does it rain in December in Saint Johns?
How many days does it snow in December in Saint Johns?
What is the month with the shortest days in Saint Johns?
What is the average length of the day in December in Saint Johns?
When is the sunrise / sunset in December in Saint Johns?
How many hours of sunshine does Saint Johns have in December?
What are the months with the lowest UV index in Saint Johns?
What is the UV index intensity in December in Saint Johns?
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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