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
Joliet's temperature records reveal December as the coldest month, marked by average highs of 30.7°F (-0.7°C) and lows of 17.4°F (-8.1°C).Humidity
In December, the average relative humidity in Joliet is 74%.Rainfall
In Joliet, during December, the rain falls for 6.2 days and regularly aggregates up to 0.63" (16mm) of precipitation. Throughout the year, there are 108.1 rainfall days, and 12.83" (326mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. In Joliet, during December, snow falls for 9.6 days and regularly aggregates up to 4.72" (120mm) of snow. Throughout the year, there are 61.5 snowfall days, and 41.77" (1061mm) of snow is accumulated.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 7:36 am and sunset at 4:34 pm. On the last day of December, sunrise is at 7:55 am and sunset at 4:42 pm MST.
Sunshine
In Joliet, the average sunshine in December is 6.4h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Joliet, Montana. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, an average UV index of 2 transforms into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Frequently asked questions
What month is the coldest in Joliet?
How cold is it in Joliet in December?
What is the average humidity in December in Joliet?
How many days does it rain in December in Joliet?
How much does it snow in Joliet in December?
What is the month with the shortest days in Joliet?
How many hours of daylight does Joliet have in December?
What time are sunrise and sunset in December in Joliet?
How long on average sun shines in December in Joliet?
What is the month with the lowest UV index in Joliet?
How high is the UV index in December in Joliet?
Average temperature in December
Joliet, MT
- Average high temperature in December: 30.7°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (30.7°F).
- Average low temperature in December: 17.4°F
The months with the highest average low temperature are July and August (57.2°F).
The coldest month (with the lowest average low temperature) is February (16.7°F).
Average pressure in December
Joliet, MT
- Average pressure in December: 30.15"Hg
The months with the highest atmospheric pressure are January and December (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Joliet, MT
- Average wind speed in December: 8.5mph
The windiest month (with the highest average wind speed) is January (8.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Joliet, MT
- Average humidity in December: 74%
The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (41%).
Average rainfall in December
Joliet, MT
- Average rainfall in December: 0.63"
The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in December
Joliet, MT
- Average rainfall days in December: 6.2 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (4 days).
Average snowfall in December
Joliet, MT
- Average snowfall in December: 4.72"
The month with the highest snowfall is February (6.81").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Joliet, MT
- Average snowfall days in December: 9.6 days
The month with the highest number of snowfall days is February (10.8 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Joliet, MT
- Average daylight in December: 8h and 5min
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: 6h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 12min).
Average sunshine days in December
Joliet, MT
- Average sunshine days in December: 19.7 days
The month with the most sunshine days is December (19.7 days).
The month with the least sunshine days is May (10.5 days).
Average UV index in December
Joliet, 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, November and December (UV index 2).
Average cloud cover in December
Joliet, MT
- Average cloud cover in December: 33
The month with the most cloud cover is February (Cloud cover 38).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in December
Joliet, 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).
Joliet, Montana, USA
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