December weather forecast
Jefferson City, MT

Weather in December

The first month of the winter, December, is also a subzero cold month in Jefferson City, Montana, with average temperature ranging between max 27°F (-2.8°C) and min 12.6°F (-10.8°C).

Temperature

The coldest month is December, with an average high-temperature of 27°F (-2.8°C) and an average low-temperature of 12.6°F (-10.8°C).

Humidity

In Jefferson City, the average relative humidity is 84%.

Rainfall

The month with the least rainfall in Jefferson City is December when the rain falls for 8.2 days and typically collects 0.79" (20mm) of precipitation.

Snowfall

January through June, September through December are months with snowfall in Jefferson City. In Jefferson City, in December, snow falls for 16.8 days, with typically accumulated 6.22" (158mm) of snow. Throughout the year, there are 105.8 snowfall days, and 55.12" (1400mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 8.7h of daylight.

Sunshine

January and December, with an average of 5.6h of sunshine, are months with the least sunshine.

UV index

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 2 transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Jefferson City?

December is the coldest month in Jefferson City, with an average high-temperature of 27°F (-2.8°C) and an average low-temperature of 12.6°F (-10.8°C).

What is the average humidity in December in Jefferson City?

In Jefferson City, the average relative humidity in December is 84%.

What is the driest month in Jefferson City?

December is the month with the least rainfall in Jefferson City. Rain falls for 8.2 days and accumulates 0.79" (20mm) of precipitation.

How many days does it rain in December in Jefferson City?

In Jefferson City, in December, it is raining for 8.2 days, with typically 0.79" (20mm) of accumulated precipitation.

How many days does it snow in December in Jefferson City?

In Jefferson City, in December, snow falls for 16.8 days, with typically accumulated 6.22" (158mm) of snow.

What is the month with the shortest days in Jefferson City?

With an average of 8.7h of daylight, December has the shortest days of the year in Jefferson City, Montana.

What is the average length of the day in December in Jefferson City?

In December, the average length of the day in Jefferson City is 8.7h.

What is the month with the least sunshine in Jefferson City?

January and December, with an average of 5.6h of sunshine, are months with the least sunshine in Jefferson City, Montana.

How long on average sun shines in December in Jefferson City?

In Jefferson City, the average sunshine in December is 5.6h.

What is the UV index reading in December in Jefferson City?

The average daily maximum UV index in December in Jefferson City, Montana, is 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to the Sun's UV rays.

Average temperature in December
Jefferson City, MT

Average temperature in December - Jefferson City, MT
  • Average high temperature in December: 27°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 (27°F).

  • Average low temperature in December: 12.6°F

The month with the highest average low temperature is August (48.6°F).
The coldest month (with the lowest average low temperature) is December (12.6°F).

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Average pressure in December
Jefferson City, MT

Average pressure in December - Jefferson City, MT
  • Average pressure in December: 30.18"

The month with the highest atmospheric pressure is January (30.19").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in December
Jefferson City, MT

Average wind speed in December - Jefferson City, MT
  • Average wind speed in December: 6.4mph

The windiest months (with the highest average wind speed) are January and November (6.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

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Average humidity in December
Jefferson City, MT

Average humidity in December - Jefferson City, MT
  • Average humidity in December: 84%

The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (46%).

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Average rainfall in December
Jefferson City, MT

Average rainfall in December - Jefferson City, MT
  • Average rainfall in December: 0.79"

The wettest month (with the highest rainfall) is June (2.68").
The driest month (with the least rainfall) is December (0.79").

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Average rainfall days in December
Jefferson City, MT

Average rainfall days in December - Jefferson City, MT
  • Average rainfall days in December: 8.2 days

The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is November (7.5 days).

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Average snowfall in December
Jefferson City, MT

Average snowfall in December - Jefferson City, MT
  • Average snowfall in December: 6.22"

The month with the highest snowfall is February (9.72").
Months with the least snowfall are July and August (0").

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Average snowfall days in December
Jefferson City, MT

Average snowfall days in December - Jefferson City, MT
  • Average snowfall days in December: 16.8 days

The month with the highest number of snowfall days is February (18 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight in December /
Average sunshine in December
Jefferson City, MT

Average daylight in December / Average sunshine in December - Jefferson City, MT
  • Average daylight in December: 8.7h

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.7h).

  • Average sunshine in December: 5.6h

The month with the most sunshine is July (Average sunshine: 11.7h).
Months with the least sunshine are January and December (Average sunshine: 5.6).

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Average sunshine days in December
Jefferson City, MT

Average sunshine days in December - Jefferson City, MT
  • Average sunshine days in December: 13.7 days

The month with the most sunshine days is September (17.9 days).
The month with the least sunshine days is February (8.5 days).

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Average UV index in December
Jefferson City, MT

Average UV index in December - Jefferson City, MT
  • Average UV index in December: 2

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

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Average cloud cover in December
Jefferson City, MT

Average cloud cover in December - Jefferson City, MT
  • Average cloud cover in December: 44

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 15).

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Average visibility in December
Jefferson City, MT

Average visibility in December - Jefferson City, MT
  • Average visibility in December: 5mi

Months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
Months with the lowest visibility are January, February, March and December (5mi).

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