December weather forecast
Jefferson City, MT

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Weather in December

December, the first month of the winter in Jefferson City, is still a freezing cold month, with an average temperature fluctuating between 27°F (-2.8°C) and 12.6°F (-10.8°C).

Temperature

December, recording an average high temperature of 27°F (-2.8°C) and a low temperature of 12.6°F (-10.8°C), is Jefferson City's coldest month.

Humidity

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

Rainfall

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

Snowfall

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

Daylight

December has the shortest days of the year, with an average of 8h and 42min of daylight.
On the first day of December, sunrise is at 7:51 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 8:11 am and sunset at 4:51 pm MST.

Sunshine

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

UV index

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In December, an average UV index of 2 transforms into the following instructions:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Updated: Jul 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest?

December, on average, is the coldest month, registering a high temperature of 27°F (-2.8°C) and a low of 12.6°F (-10.8°C).

How cold is it in December?

In December, in Jefferson City, the average high-temperature is 27°F (-2.8°C), and the average low-temperature is 12.6°F (-10.8°C).

What is the average humidity in December?

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

What is the driest month?

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

How many days does it rain in December?

In December, the rain falls for 8.2 days. Throughout December, 0.79" (20mm) of precipitation is accumulated.

How much does it snow in Jefferson City in December?

In Jefferson City, Montana, during December, snow falls for 16.8 days and regularly aggregates up to 6.22" (158mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year in Jefferson City, with an average of 8h and 42min of daylight.

How many hours of daylight does Jefferson City have in December?

In Jefferson City, the average day length in December is 8h and 40min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:51 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 8:11 am and sunset at 4:51 pm MST.

What are the months with the least sunshine?

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

How long on average sun shines in December?

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

How high is the UV index in December in Jefferson City?

In December, the average daily maximum UV index in Jefferson City is 2. A UV Index value of 2, and less, symbolizes 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
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).

Average pressure in December
Jefferson City, MT

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

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

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).

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%).

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").

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).

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").
The months with the least snowfall are July and August (0").

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).
The months with the least snowfall days are July and August (0 days).

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: 8h and 4min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in December: 5h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).

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).

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).

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).

Average visibility in December
Jefferson City, MT

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

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

Jefferson City, Montana, USA

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