December weather forecast
Butte, MT

Houses and old frames in an open space that is a former mine ground in Butte, Montana
Houses and old frames in an open space that is a former mine ground in Butte, Montana

Weather in December

December, the first month of the winter in Butte, is still a freezing cold month, with an average temperature ranging between max 25.2°F (-3.8°C) and min 9°F (-12.8°C).

Temperature

With an average high-temperature of 25.2°F (-3.8°C) and an average low-temperature of 9°F (-12.8°C), December is the coldest month.

Humidity

January, February and December, with an average relative humidity of 87%, are the most humid months in Butte.

Rainfall

January, November and December are months with the least rain in Butte when the rain falls for 5.7 days and typically aggregates up to 0.67" (17mm) of rain.

Snowfall

January through June, September through December are months with snowfall. In Butte, in December, during 15.3 snowfall days, 5.51" (140mm) of snow is typically accumulated. In Butte, during the entire year, snow falls for 103.1 days and aggregates up to 52.56" (1335mm) of snow.

Daylight

December has the shortest days of the year in Butte, Montana, with an average of 8h and 43min of daylight.
On the first day of the month, sunrise is at 7:51 am and sunset at 4:46 pm. On the last day of December, in Butte, Montana, sunrise is at 8:11 am and sunset at 4:54 pm MST.

Sunshine

The month with the least sunshine is December, with an average of 5.3h of sunshine.

UV index

The average daily maximum UV index in December in Butte is 2. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Butte?

The coldest month in Butte, Montana, is December, with an average high-temperature of 25.2°F (-3.8°C) and an average low-temperature of 9°F (-12.8°C).

What are the most humid months in Butte?

The months with the highest humidity in Butte are January, February and December, with an average relative humidity of 87%.

What is the average humidity in December in Butte?

In December, the average relative humidity in Butte is 87%.

What is the driest month in Butte?

The months with the least rainfall are January, November and December Rain falls for 5.7 days and accumulates 0.67" (17mm) of rain.

How many days does it rain in December in Butte?

In Butte, during December, the rain falls for 5.7 days and regularly aggregates up to 0.67" (17mm) of precipitation.

How many days does it snow in December in Butte?

In Butte, in December, snow falls for 15.3 days, with typically accumulated 5.51" (140mm) of snow.

What is the month with the shortest days in Butte?

The month with the shortest days is December, with an average of 8h and 43min of daylight.

What is the average length of the day in December in Butte?

The average day length in December in Butte, Montana, is 8h and 43min.

When is the sunrise / sunset in December in Butte?

In December, on the first day of the month, sunrise is at 7:51 am and sunset at 4:46 pm. On the last day of the month, in Butte, sunrise is at 8:11 am and sunset at 4:54 pm MST.

What is the month with the least sunshine in Butte?

December has the least sunshine of the year, with an average of 5.3h of sunshine.

How many hours of sunshine does Butte have in December?

The average sunshine duration in December in Butte, Montana, is 5.3h.

What is the UV index reading in December in Butte?

The average daily maximum UV index in December in Butte, Montana, is 2. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Butte, MT

Average temperature in December - Butte, MT
  • Average high temperature in December: 25.2°F

The warmest month (with the highest average high temperature) is July (76.5°F).
The month with the lowest average high temperature is December (25.2°F).

  • Average low temperature in December: 9°F

The month with the highest average low temperature is July (46.9°F).
The coldest month (with the lowest average low temperature) is December (9°F).

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Average pressure in December
Butte, MT

Average pressure in December - Butte, MT
  • Average pressure in December: 30.2"Hg

The month with the highest atmospheric pressure is January (30.21"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in December
Butte, MT

Average wind speed in December - Butte, MT
  • Average wind speed in December: 6.2mph

The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in December
Butte, MT

Average humidity in December - Butte, MT
  • Average humidity in December: 87%

The months with the highest relative humidity are January, February and December (87%).
The month with the lowest relative humidity is July (48%).

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Average rainfall in December
Butte, MT

Average rainfall in December - Butte, MT
  • Average rainfall in December: 0.67"

The wettest month (with the highest rainfall) is May (2.24").
The driest months (with the least rainfall) are January, November and December (0.67").

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Average rainfall days in December
Butte, MT

Average rainfall days in December - Butte, MT
  • Average rainfall days in December: 5.7 days

The month with the highest number of rainy days is May (15.9 days).
The month with the least rainy days is November (4.1 days).

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Average snowfall in December
Butte, MT

Average snowfall in December - Butte, MT
  • Average snowfall in December: 5.51"

The month with the highest snowfall is March (8.74").
The months with the least snowfall are July and August (0").

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Average snowfall days in December
Butte, MT

Average snowfall days in December - Butte, MT
  • Average snowfall days in December: 15.3 days

The month with the highest number of snowfall days is February (17.7 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight in December /
Average sunshine in December
Butte, MT

Average daylight in December / Average sunshine in December - Butte, MT
  • Average daylight in December: 8h and 43min

The month with the longest days is June (Average daylight: 15h and 41min).
The month with the shortest days is December (Average daylight: 8h and 43min).

  • Average sunshine in December: 5h and 18min

The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).

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Average sunshine days in December
Butte, MT

Average sunshine days in December - Butte, MT
  • Average sunshine days in December: 15.3 days

The month with the most sunshine days is August (19.1 days).
The month with the least sunshine days is April (9.8 days).

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Average UV index in December
Butte, MT

Average UV index in December - Butte, MT
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is February (UV index 1).

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Average cloud cover in December
Butte, MT

Average cloud cover in December - Butte, MT
  • Average cloud cover in December: 48

The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 16).

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Average visibility in December
Butte, MT

Average visibility in December - Butte, MT
  • Average visibility in December: 4mi

The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).

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