December weather forecast
Ravalli, MT

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Weather in December

The first month of the winter, December, is also a subzero cold month in Ravalli, Montana, with an average temperature varying between 16.7°F (-8.5°C) and 28.4°F (-2°C).

Temperature

The coldest temperatures occur during December, when averages reach a peak of 28.4°F (-2°C) and a low of 16.7°F (-8.5°C).

Humidity

The average relative humidity in December in Ravalli is 88%.

Rainfall

In Ravalli, in December, it is raining for 9.8 days, with typically 1.06" (27mm) of accumulated precipitation. In Ravalli, Montana, during the entire year, the rain falls for 129.9 days and collects up to 13.5" (343mm) of precipitation.

Snowfall

Months with snowfall in Ravalli are January through May, September through December. In Ravalli, during December, snow falls for 14.5 days and regularly aggregates up to 5.39" (137mm) of snow. In Ravalli, Montana, during the entire year, snow falls for 67.1 days and aggregates up to 28.27" (718mm) of snow.

Daylight

December has the shortest days of the year in Ravalli, with an average of 8h and 36min of daylight.
On the first day of December, sunrise is at 8:03 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 8:23 am and sunset at 4:56 pm MST.

Sunshine

In December, the average sunshine in Ravalli is 5.1h.

UV index

February and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: In December, a regular UV index of 1 translates into these guidelines:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the coldest in Ravalli?

In Ravalli, December is the coldest month, with temperatures averaging a high of 28.4°F (-2°C) and a low of 16.7°F (-8.5°C).

How cold is it in Ravalli in December?

An average high-temperature, in December, in Ravalli, is 28.4°F (-2°C) and the average low-temperature is 16.7°F (-8.5°C).

What is the average humidity in December in Ravalli?

The average relative humidity in December in Ravalli is 88%.

How many days does it rain in December in Ravalli?

In Ravalli, Montana, in December, during 9.8 rainfall days, 1.06" (27mm) of precipitation is typically accumulated.

How many days does it snow in December in Ravalli?

In Ravalli, Montana, in December, snow falls for 14.5 days, with typically accumulated 5.39" (137mm) of snow.

What is the month with the shortest days in Ravalli?

The month with the shortest days in Ravalli is December, with an average of 8h and 36min of daylight.

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

In December, the average day length in Ravalli, Montana, is 8h and 33min.

When is the sunrise / sunset in December in Ravalli?

In December, on the first day of the month, sunrise is at 8:03 am and sunset at 4:48 pm. On the last day of the month, in Ravalli, sunrise is at 8:23 am and sunset at 4:56 pm MST.

How long on average sun shines in December in Ravalli?

In December, the average sunshine duration in Ravalli, Montana, is 5.1h.

When is the lowest UV index in Ravalli?

The months with the lowest UV index in Ravalli, Montana, are February and December, with an average maximum UV index of 1.

How high is the UV index in December in Ravalli?

The average daily maximum UV index in December in Ravalli, Montana, is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health from 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
Ravalli, MT

Average temperature in December - Ravalli, MT
  • Average high temperature in December: 28.4°F

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is December (28.4°F).

  • Average low temperature in December: 16.7°F

The month with the highest average low temperature is August (49.5°F).
The coldest month (with the lowest average low temperature) is December (16.7°F).

Average pressure in December
Ravalli, MT

Average pressure in December - Ravalli, MT
  • Average pressure in December: 30.17"Hg

The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in December
Ravalli, MT

Average wind speed in December - Ravalli, MT
  • Average wind speed in December: 3.9mph

The windiest month (with the highest average wind speed) is April (4.8mph).
The calmest months (with the lowest average wind speed) are January, August and December (3.9mph).

Average humidity in December
Ravalli, MT

Average humidity in December - Ravalli, MT
  • Average humidity in December: 88%

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (49%).

Average rainfall in December
Ravalli, MT

Average rainfall in December - Ravalli, MT
  • Average rainfall in December: 1.06"

The wettest month (with the highest rainfall) is June (2.2").
The driest months (with the least rainfall) are July and August (0.63").

Average rainfall days in December
Ravalli, MT

Average rainfall days in December - Ravalli, MT
  • Average rainfall days in December: 9.8 days

The month with the highest number of rainy days is June (15.7 days).
The month with the least rainy days is August (7.4 days).

Average snowfall in December
Ravalli, MT

Average snowfall in December - Ravalli, MT
  • Average snowfall in December: 5.39"

The month with the highest snowfall is February (6.5").
The months with the least snowfall are June, July and August (0").

Average snowfall days in December
Ravalli, MT

Average snowfall days in December - Ravalli, MT
  • Average snowfall days in December: 14.5 days

The month with the highest number of snowfall days is December (14.5 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Ravalli, MT
  • Average daylight in December: 8h and 4min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

Average sunshine days in December
Ravalli, MT

Average sunshine days in December - Ravalli, MT
  • Average sunshine days in December: 13.5 days

The month with the most sunshine days is July (20.8 days).
The month with the least sunshine days is February (11 days).

Average UV index in December
Ravalli, MT

Average UV index in December - Ravalli, MT
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are February and December (UV index 1).

Average cloud cover in December
Ravalli, MT

Average cloud cover in December - Ravalli, MT
  • Average cloud cover in December: 49

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 14).

Average visibility in December
Ravalli, MT

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

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

Ravalli, Montana, USA

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