Climate and monthly weather forecast
Jefferson City, MT

Weather in January

January, like December, is another subzero cold winter month in Jefferson City, Montana, with an average temperature ranging between min 14.5°F (-9.7°C) and max 29.7°F (-1.3°C). In January, the average high-temperature is essentially the same as in December - a still subzero cold 29.7°F (-1.3°C). Weather in January »

Weather in February

The last month of the winter, February, is also a subzero cold month in Jefferson City, Montana, with an average temperature fluctuating between 29.3°F (-1.5°C) and 13.5°F (-10.3°C). In February, the average high-temperature is essentially the same as in January - a still freezing cold 29.3°F (-1.5°C). Weather in February »

Weather in March

March, the first month of the spring in Jefferson City, is a cold month, with temperature in the range of an average high of 38.7°F (3.7°C) and an average low of 21.6°F (-5.8°C). In Jefferson City, the average high-temperature in March rises from a subzero cold 29.3°F (-1.5°C) in February to a cold 38.7°F (3.7°C). Weather in March »

Weather in April

April in Jefferson City, Montana, is a frosty spring month, with an average temperature ranging between min 27°F (-2.8°C) and max 46.4°F (8°C). In Jefferson City, the average high-temperature in April slightly increases from a wintry 38.7°F (3.7°C) in March to a frosty 46.4°F (8°C). Weather in April »

Weather in May

May, the last month of the spring in Jefferson City, is a mild month, with an average temperature ranging between min 35.2°F (1.8°C) and max 58.5°F (14.7°C). In Jefferson City, the average high-temperature in May rises from a chilly 46.4°F (8°C) in April to a mild 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 an average temperature ranging between max 68.5°F (20.3°C) and min 42.4°F (5.8°C). In Jefferson City, the average high-temperature in June rises from a mild 58.5°F (14.7°C) in May to a pleasant 68.5°F (20.3°C). Weather in June »

Weather in July

July in Jefferson City, Montana, is a moderately hot summer month, with an average temperature varying between 79.7°F (26.5°C) and 48.4°F (9.1°C). With an average high-temperature of 79.7°F (26.5°C) and an average low-temperature of 48.4°F (9.1°C), July is the warmest month. Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Jefferson City, Montana, with temperature in the range of an average high of 77.5°F (25.3°C) and an average low of 48.6°F (9.2°C). In August, the average high-temperature is essentially the same as in July - a still moderately hot 77.5°F (25.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a comfortable month in Jefferson City, Montana, with an average temperature fluctuating between 42.4°F (5.8°C) and 67.5°F (19.7°C). In September, the average high-temperature drops from a moderately hot 77.5°F (25.3°C) in August to an enjoyable 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 an average temperature fluctuating between 31.3°F (-0.4°C) and 50.9°F (10.5°C). In October, the average high-temperature declines considerably 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 also a wintry month in Jefferson City, Montana, with an average temperature varying between 21.2°F (-6°C) and 36.9°F (2.7°C). In November, the average high-temperature decreases from a cool 50.9°F (10.5°C) in October to a wintry 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 ranging between max 27°F (-2.8°C) and min 12.6°F (-10.8°C). With an average high-temperature of 27°F (-2.8°C) and an average low-temperature of 12.6°F (-10.8°C), December is the coldest month. Weather in December »
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FAQ

What is the most humid month in Jefferson City?

With an average relative humidity of 86%, January is the most humid month.

How many days does it rain in Jefferson City?

In Jefferson City, Montana, during the entire year, the rain falls for 133.7 days and collects up to 16.38" (416mm) of precipitation.

When does it snow in Jefferson City?

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

How many days does it snow in Jefferson City?

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

What are the months with the least sunshine in Jefferson City?

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

When does it snow the most in Jefferson City?

February is the month with the most snowfall. Snow falls for 18 days and accumulates 9.72" (247mm) of snow.

When is the lowest UV index in Jefferson City?

The month with the lowest UV index in Jefferson City, Montana, is February, with an average maximum UV index of 1.

When is Daylight Saving Time (DST) in Jefferson City?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from MDT to MST.

What is the wettest month in Jefferson City?

The month with the most rainfall is June, when the rain falls for 16 days and typically aggregates up to 2.68" (68mm) of precipitation.

When are the longest days in Jefferson City?

June has the longest days of the year, with an average of 15h and 45min of daylight.

What is the warmest month in Jefferson City?

The warmest month in Jefferson City, Montana, is July, with an average high-temperature of 79.7°F (26.5°C) and an average low-temperature of 48.4°F (9.1°C).

When it does not snow in Jefferson City?

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

What month has the most sunshine in Jefferson City?

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

What is the month with the highest UV index in Jefferson City?

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

What is the least humid month in Jefferson City?

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

What 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), December is the coldest month.

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.

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

The month with the shortest days in Jefferson City, Montana, is December, with an average of 8h and 40min 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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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 45min).
The month with the shortest days is December (Average daylight: 8h and 40min).

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).

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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).

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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).

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