December weather forecast
Thompson Falls, MT

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Weather in December

December climate culminates in the most winter-centric weather of the year in Thompson Falls. A measurable snowfall of 13.35" (339mm) encapsulates the city creating a winter wonderland in its wake. The rising humidity combines with decreased sunlight hours, recording a short 8.5 hours, contributing to December's festive but chilly atmosphere. Indeed, Thompson Fall's winter weather sets the ideal backdrop for the holiday season.

Temperature

In Thompson Falls, the lowest average temperatures are observed in December, with a high of 28.9°F (-1.7°C) and a low of 16.2°F (-8.8°C).

Humidity

The average relative humidity in December is 91%.

Rainfall

In December, in Thompson Falls, the rain falls for 12.2 days. Throughout December, 2.99" (76mm) of precipitation is accumulated. In Thompson Falls, Montana, during the entire year, the rain falls for 152.1 days and collects up to 22.09" (561mm) of precipitation.

Snowfall

Months with snowfall are January through May, September through December. In Thompson Falls, Montana, in December, snow falls for 20.4 days, with typically accumulated 13.35" (339mm) of snow. Throughout the year, there are 90.2 snowfall days, and 58.15" (1477mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 8h and 30min of daylight.
On the first day of December, sunrise is at 8:09 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 8:29 am and sunset at 5:00 pm MST.

Sunshine

In December, the average sunshine is 3.8h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: In December, the maximum UV index of 1 translates into these guidelines:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. To guard against the harmful effects of the Sun, minimize exposure during midday. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
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Frequently asked questions

What are the coldest months in Thompson Falls?

December proves to be the coldest month, recording an average maximum temperature of 28.9°F (-1.7°C) and a minimum temperature of 16.2°F (-8.8°C).

How cold is December in Thompson Falls?

In Thompson Falls, in December, the average high-temperature is 28.9°F (-1.7°C), and the average low-temperature is 16.2°F (-8.8°C).

What is the average humidity in December in Thompson Falls?

In December, the average relative humidity in Thompson Falls is 91%.

How many days does it rain in December in Thompson Falls?

In Thompson Falls, during December, the rain falls for 12.2 days and regularly aggregates up to 2.99" (76mm) of precipitation.

How much does it snow in Thompson Falls in December?

In December, in Thompson Falls, it is snowing for 20.4 days. Throughout December, 13.35" (339mm) of snow is accumulated.

What is the month with the shortest days in Thompson Falls?

With an average of 8h and 30min of daylight, December has the shortest days of the year.

What is the average length of the day in December in Thompson Falls?

In Thompson Falls, Montana, the average day length in December is 8h and 31min.

What time are sunrise and sunset in December in Thompson Falls?

In December, on the first day of the month, sunrise is at 8:09 am and sunset at 4:51 pm. On the last day of the month, in Thompson Falls, Montana, sunrise is at 8:29 am and sunset at 5:00 pm MST.

How long on average sun shines in December in Thompson Falls?

In December, the average sunshine duration is 3.8h.

When is the lowest UV index in Thompson Falls?

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Thompson Falls, Montana.

How high is the UV index in December in Thompson Falls?

In Thompson Falls, Montana, the average daily maximum UV index in December is 1. A UV Index reading of 2, and below, represents a minimal health vulnerability 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
Thompson Falls, MT

Average temperature in December - Thompson Falls, MT
  • Average high temperature in December: 28.9°F

The warmest months (with the highest average high temperature) are July and August (78.8°F).
The month with the lowest average high temperature is December (28.9°F).

  • Average low temperature in December: 16.2°F

The month with the highest average low temperature is August (45.7°F).
The coldest month (with the lowest average low temperature) is December (16.2°F).

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Average pressure in December
Thompson Falls, MT

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

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in December
Thompson Falls, MT

Average wind speed in December - Thompson Falls, MT
  • Average wind speed in December: 4mph

The windiest month (with the highest average wind speed) is April (4.9mph).
The calmest month (with the lowest average wind speed) is December (4mph).

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Average humidity in December
Thompson Falls, MT

Average humidity in December - Thompson Falls, MT
  • Average humidity in December: 91%

The month with the highest relative humidity is January (93%).
The months with the lowest relative humidity are July and August (53%).

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Average rainfall in December
Thompson Falls, MT

Average rainfall in December - Thompson Falls, MT
  • Average rainfall in December: 2.99"

The wettest month (with the highest rainfall) is January (3.11").
The driest month (with the least rainfall) is August (0.39").

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Average rainfall days in December
Thompson Falls, MT

Average rainfall days in December - Thompson Falls, MT
  • Average rainfall days in December: 12.2 days

The month with the highest number of rainy days is March (19.9 days).
The month with the least rainy days is August (5.9 days).

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Average snowfall in December
Thompson Falls, MT

Average snowfall in December - Thompson Falls, MT
  • Average snowfall in December: 13.35"

The month with the highest snowfall is February (15.12").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in December
Thompson Falls, MT

Average snowfall days in December - Thompson Falls, MT
  • Average snowfall days in December: 20.4 days

The month with the highest number of snowfall days is December (20.4 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in December /
Average sunshine in December
Thompson Falls, MT

Average daylight in December / Average sunshine in December - Thompson Falls, MT
  • Average daylight in December: 8h and 3min

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 30min).

  • Average sunshine in December: 3h and 5min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

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Average sunshine days in December
Thompson Falls, MT

Average sunshine days in December - Thompson Falls, MT
  • Average sunshine days in December: 8.1 days

The months with the most sunshine days are July and August (23.3 days).
The month with the least sunshine days is March (5.8 days).

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Average UV index in December
Thompson Falls, MT

Average UV index in December - Thompson Falls, 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 January, February, November and December (UV index 1).

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Average cloud cover in December
Thompson Falls, MT

Average cloud cover in December - Thompson Falls, MT
  • Average cloud cover in December: 63

The month with the most cloud cover is February (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 15).

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Average visibility in December
Thompson Falls, MT

Average visibility in December - Thompson Falls, MT
  • Average visibility in December: 3mi

The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February and December (3mi).

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Thompson Falls, Montana, USA

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