Climate and monthly weather forecast
Jefferson City, MT

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Weather in January

January, the same as December, in Jefferson City, Montana, is another subzero cold winter month, with an average temperature ranging between max 29.7°F (-1.3°C) and min 14.5°F (-9.7°C). The onset of January notes an average high-temperature of a still subzero cold 29.7°F (-1.3°C), subtly shifted from December's 27°F (-2.8°C). Weather in January »

Weather in February

February, the last month of the winter in Jefferson City, is another freezing cold month, with an average temperature fluctuating between 13.5°F (-10.3°C) and 29.3°F (-1.5°C). The advent of February signifies a minor shift to an average high-temperature of a still subzero cold 29.3°F (-1.5°C), aligning closely with January. Weather in February »

Weather in March

March, the first month of the spring in Jefferson City, is a wintry month, with an average temperature varying between 21.6°F (-5.8°C) and 38.7°F (3.7°C). March's arrival signals an increase in average high-temperatures, moving from February's subzero cold 29.3°F (-1.5°C) to an icy 38.7°F (3.7°C). Weather in March »

Weather in April

April is a frosty spring month in Jefferson City, Montana, with an average temperature fluctuating between 27°F (-2.8°C) and 46.4°F (8°C). The shift into April is characterized by a subtle rise in the average high-temperature, transitioning from March's icy 38.7°F (3.7°C) to a chilly 46.4°F (8°C). Weather in April »

Weather in May

The last month of the spring, May, is a refreshing month in Jefferson City, Montana, with an average temperature varying between 58.5°F (14.7°C) and 35.2°F (1.8°C). The arrival of May sees a shift in the average high-temperature, moving from a chilly 46.4°F (8°C) in April to a moderate 58.5°F (14.7°C). Weather in May »

Weather in June

The first month of the summer, June, is a pleasant month in Jefferson City, Montana, with temperature in the range of an average low of 42.4°F (5.8°C) and an average high of 68.5°F (20.3°C). With the onset of June, Jefferson City's average high-temperature sees a rise, moving from May's moderate 58.5°F (14.7°C) to an agreeable 68.5°F (20.3°C). Weather in June »

Weather in July

July is a warm summer month in Jefferson City, Montana, with temperature in the range of an average high of 79.7°F (26.5°C) and an average low of 48.4°F (9.1°C). In Jefferson City, the month of July registers the highest temperatures, averaging 79.7°F (26.5°C) at the peak and 48.4°F (9.1°C) at the lowest. Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Jefferson City, Montana, with an average temperature varying between 77.5°F (25.3°C) and 48.6°F (9.2°C). Entering August, Jefferson City's average high-temperature reads a still moderately hot 77.5°F (25.3°C), indicating a close resemblance to the previous month's climate. Weather in August »

Weather in September

The first month of the autumn, September, is still a comfortable month in Jefferson City, Montana, with temperature in the range of an average high of 67.5°F (19.7°C) and an average low of 42.4°F (5.8°C). September's onset brings a reduction in the average high-temperature, from a warm 77.5°F (25.3°C) in August to a comfortable 67.5°F (19.7°C). Weather in September »

Weather in October

October, the same as September, is a cool autumn month in Jefferson City, Montana, with temperature in the range of an average low of 31.3°F (-0.4°C) and an average high of 50.9°F (10.5°C). October's arrival signals a distinct temperature shift, dropping from a comfortable 67.5°F (19.7°C) in September to a cool 50.9°F (10.5°C). Weather in October »

Weather in November

The last month of the autumn, November, is another cold month in Jefferson City, Montana, with temperature in the range of an average high of 36.9°F (2.7°C) and an average low of 21.2°F (-6°C). November's arrival coincides with a drop in the average high-temperature, decreasing from October's cool 50.9°F (10.5°C) to a cold 36.9°F (2.7°C). Weather in November »

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). 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. Weather in December »
Updated: Jul 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the most humid month?

The most humid month is January, with an average relative humidity of 86%.

How many days does it rain?

Throughout the year, there are 133.7 rainfall days, and 16.38" (416mm) of precipitation is accumulated.

When does it snow?

Months with snowfall are January through June, September through December.

How many days does it snow?

Throughout the year, there are 105.8 snowfall days, and 55.12" (1400mm) of snow is accumulated.

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.

What is the snowiest month?

The month with the most snowfall is February, when snow falls for 18 days and typically aggregates up to 9.72" (247mm) of snow.

What is the month with the lowest UV index?

With an average maximum UV index of 1, February is the month with the lowest UV index.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.

What is the rainiest month in Jefferson City?

June is the month with the most rainfall. Rain falls for 16 days and accumulates 2.68" (68mm) of precipitation.

When are the longest days?

The month with the longest days is June, with an average of 15h and 42min of daylight.

What time of the year is the hottest in Jefferson City?

July temperatures tend to peak at an average high of 79.7°F (26.5°C) and dip to a low of 48.4°F (9.1°C).

When it does not snow?

In Jefferson City, snow does not fall in July and August.

What month has the most sunshine?

The month with the most sunshine is July, with an average of 11.7h of sunshine.

When is the highest UV index?

The month with the highest UV index in Jefferson City is July, with an average maximum UV index of 6.

What is the least humid month?

August is the least humid month, with an average relative humidity of 46%.

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).

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.

What is the month with the shortest days?

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

Average temperature
Jefferson City, MT

Average temperature - Jefferson City, MT

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).

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
Jefferson City, MT

Average pressure - Jefferson City, MT

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
Jefferson City, MT

Average wind speed - Jefferson City, MT

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
Jefferson City, MT

Average humidity - Jefferson City, MT

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

Average rainfall
Jefferson City, MT

Average rainfall - Jefferson City, MT

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
Jefferson City, MT

Average rainfall days - Jefferson City, MT

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
Jefferson City, MT

Average snowfall - Jefferson City, MT

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

Average snowfall days
Jefferson City, MT

Average snowfall days - Jefferson City, MT

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 / Average sunshine
Jefferson City, MT

Average daylight / Average sunshine - Jefferson City, MT

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).

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
Jefferson City, MT

Average sunshine days - Jefferson City, MT

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 visibility
Jefferson City, MT

Average visibility - Jefferson City, MT

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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