Climate and monthly weather forecast
Lewistown, MT

Weather in January

January, the same as December, in Lewistown, Montana, is another subzero cold winter month, with an average temperature ranging between min 16.9°F (-8.4°C) and max 30.6°F (-0.8°C). In Lewistown, the average high-temperature in January is almost the same as in December - a still freezing cold 30.6°F (-0.8°C). Weather in January »

Weather in February

February, the last month of the winter in Lewistown, is also a subzero cold month, with an average temperature fluctuating between 29.1°F (-1.6°C) and 15.3°F (-9.3°C). The coldest months are February and December, with an average high-temperature of 29.1°F (-1.6°C). Weather in February »

Weather in March

March, the first month of the spring in Lewistown, is a cold month, with an average temperature fluctuating between 25.3°F (-3.7°C) and 40.6°F (4.8°C). In March, the average high-temperature increases from a freezing cold 29.1°F (-1.6°C) in February to a cold 40.6°F (4.8°C). Weather in March »

Weather in April

April is a frosty spring month in Lewistown, Montana, with temperature in the range of an average high of 47.8°F (8.8°C) and an average low of 31.8°F (-0.1°C). In Lewistown, Montana, the average high-temperature in April slightly increases from a cold 40.6°F (4.8°C) in March to a chilly 47.8°F (8.8°C). Weather in April »

Weather in May

May, the last month of the spring in Lewistown, is a mild month, with temperature in the range of an average low of 40.1°F (4.5°C) and an average high of 58.5°F (14.7°C). In Lewistown, the average high-temperature in May rises from a frosty 47.8°F (8.8°C) in April to a moderate 58.5°F (14.7°C). Weather in May »

Weather in June

June, the first month of the summer in Lewistown, is a pleasant month, with an average temperature fluctuating between 47.8°F (8.8°C) and 68.5°F (20.3°C). In Lewistown, the average high-temperature in June increases from a mild 58.5°F (14.7°C) in May to an agreeable 68.5°F (20.3°C). Weather in June »

Weather in July

July is a moderately hot summer month in Lewistown, Montana, with an average temperature fluctuating between 78.8°F (26°C) and 54.3°F (12.4°C). July is the warmest month, with an average high-temperature of 78.8°F (26°C) and an average low-temperature of 54.3°F (12.4°C). Weather in July »

Weather in August

August, the last month of the summer in Lewistown, is also a moderately hot month, with an average temperature ranging between min 54.5°F (12.5°C) and max 78.1°F (25.6°C). In August, the average high-temperature is relatively the same as in July - a still moderately hot 78.1°F (25.6°C). Weather in August »

Weather in September

The first month of the autumn, September, is also an enjoyable month in Lewistown, Montana, with temperature in the range of an average low of 47.1°F (8.4°C) and an average high of 67.5°F (19.7°C). In September, the average high-temperature drops from a moderately hot 78.1°F (25.6°C) in August to a comfortable 67.5°F (19.7°C). Weather in September »

Weather in October

October, like September, in Lewistown, Montana, is another fresh autumn month, with an average temperature varying between 52.2°F (11.2°C) and 35.1°F (1.7°C). In Lewistown, Montana, the average high-temperature in October plummets from an enjoyable 67.5°F (19.7°C) in September to a fresh 52.2°F (11.2°C). Weather in October »

Weather in November

November, the last month of the autumn in Lewistown, is also a wintry month, with temperature in the range of an average low of 25.2°F (-3.8°C) and an average high of 39.2°F (4°C). In Lewistown, the average high-temperature in November drops from a cool 52.2°F (11.2°C) in October to a cold 39.2°F (4°C). Weather in November »

Weather in December

December, the first month of the winter in Lewistown, is also a subzero cold month, with an average temperature fluctuating between 16°F (-8.9°C) and 29.1°F (-1.6°C). February and December, with an average high-temperature of 29.1°F (-1.6°C), are the coldest months. Weather in December »
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FAQ

How much does it rain in Lewistown?

Throughout the year, there are 126.2 rainfall days, and 17.83" (453mm) of precipitation is accumulated.

When does it snow in Lewistown?

January through June, September through December are months with snowfall in Lewistown.

How much does it snow in Lewistown?

Throughout the year, there are 83.4 snowfall days, and 45.51" (1156mm) of snow is accumulated.

What is the month with the lowest UV index in Lewistown?

The months with the lowest UV index in Lewistown are January through April, October through December, with an average maximum UV index of 2.

What are the coldest months in Lewistown?

The coldest months in Lewistown are February and December, with an average high-temperature of 29.1°F (-1.6°C).

What is the most humid month in Lewistown?

February is the most humid month, with an average relative humidity of 79%.

What is the month with the least sunshine in Lewistown?

The month with the least sunshine in Lewistown is February, with an average of 5.5h of sunshine.

When is Daylight Saving Time (DST) in Lewistown?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Lewistown, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from MDT to MST.

What is the snowiest month in Lewistown?

The month with the most snowfall is April, when snow falls for 10 days and typically aggregates up to 9.13" (232mm) of snow.

What is the rainiest month in Lewistown?

The month with the most rainfall is May, when the rain falls for 19.3 days and typically aggregates up to 3.39" (86mm) of precipitation.

When are the longest days in Lewistown?

With an average of 15h and 50min of daylight, June has the longest days of the year in Lewistown, Montana.

What is the warmest month in Lewistown?

July is the warmest month, with an average high-temperature of 78.8°F (26°C) and an average low-temperature of 54.3°F (12.4°C).

When it does not snow in Lewistown?

In Lewistown, snow does not fall in July and August.

What month has the most sunshine in Lewistown?

July has the most sunshine of the year in Lewistown, with an average of 11.8h of sunshine.

What is the month with the highest UV index in Lewistown?

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

What is the least humid month in Lewistown?

The least humid month is August, with an average relative humidity of 47%.

What is the driest month in Lewistown?

December is the month with the least rainfall in Lewistown. Rain falls for 6 days and accumulates 0.71" (18mm) of precipitation.

What is the month with the shortest days in Lewistown?

The month with the shortest days in Lewistown is December, with an average of 8h and 35min of daylight.

Average temperature
Lewistown, MT

Average temperature - Lewistown, MT

The warmest month (with the highest average high temperature) is July (78.8°F).
The months with the lowest average high temperature are February and December (29.1°F).

The month with the highest average low temperature is August (54.5°F).
The coldest month (with the lowest average low temperature) is February (15.3°F).

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Average pressure
Lewistown, MT

Average pressure - Lewistown, MT

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

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Average wind speed
Lewistown, MT

Average wind speed - Lewistown, MT

The windiest months (with the highest average wind speed) are January, April and October (9.9mph).
The calmest month (with the lowest average wind speed) is August (7.4mph).

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Average rainfall
Lewistown, MT

Average rainfall - Lewistown, MT

The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is December (0.71").

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Average rainfall days
Lewistown, MT

Average rainfall days - Lewistown, MT

The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (5.4 days).

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Average snowfall
Lewistown, MT

Average snowfall - Lewistown, MT

The month with the highest snowfall is April (9.13").
The months with the least snowfall are July and August (0").

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Average snowfall days
Lewistown, MT

Average snowfall days - Lewistown, MT

The month with the highest number of snowfall days is February (15.2 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight / Average sunshine
Lewistown, MT

Average daylight / Average sunshine - Lewistown, MT

The month with the longest days is June (Average daylight: 15h and 50min).
The month with the shortest days is December (Average daylight: 8h and 35min).

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).

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Average sunshine days
Lewistown, MT

Average sunshine days - Lewistown, MT

The month with the most sunshine days is September (19.3 days).
The month with the least sunshine days is April (8.3 days).

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Average UV index
Lewistown, MT

Average UV index - Lewistown, MT

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average visibility
Lewistown, MT

Average visibility - Lewistown, MT

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

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