Lewistown
Montana, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Lewistown, MT

January, the same as December, in Lewistown, Montana, is a freezing cold winter month, with temperature in the range of an average low of 10.6°F (-11.9°C) and an average high of 31.8°F (-0.1°C). With an average high-temperature of 31.8°F (-0.1°C) and an average low-temperature of 10.6°F (-11.9°C), January is the coldest month. Weather in January »
February, the last month of the winter, in Lewistown, is a cold month, with average temperature fluctuating between 14.7°F (-9.6°C) and 36.3°F (2.4°C). In Lewistown, the average high-temperature is almost the same as in January - a wintry 36.3°F (2.4°C). Weather in February »

The first month of the spring, March, is a frosty month in Lewistown, Montana, with temperature in the range of an average high of 43°F (6.1°C) and an average low of 21.4°F (-5.9°C). In March, the average high-temperature marginally rises, from a cold 36.3°F (2.4°C) in February, to a frosty 43°F (6.1°C). Weather in March »

April in Lewistown, Montana, is a cool spring month, with average temperature ranging between min 29.1°F (-1.6°C) and max 53.2°F (11.8°C). In April, the average high-temperature rises, from a chilly 43°F (6.1°C) in March, to a fresh 53.2°F (11.8°C). Weather in April »

May, the last month of the spring, in Lewistown, is an enjoyable month, with average temperature fluctuating between 37.6°F (3.1°C) and 62.6°F (17°C). In May, the average high-temperature increases, from a cool 53.2°F (11.8°C) in April, to an enjoyable 62.6°F (17°C). Weather in May »

The first month of the summer, June, is an agreeable month in Lewistown, Montana, with average temperature varying between 45°F (7.2°C) and 71.4°F (21.9°C). In June, the average high-temperature slightly increases, from an enjoyable 62.6°F (17°C) in May, to an agreeable 71.4°F (21.9°C). Weather in June »

July is a warm summer month in Lewistown, Montana, with average temperature varying between 79.5°F (26.4°C) and 49.5°F (9.7°C). In July, the average high-temperature slightly increases, from a pleasant 71.4°F (21.9°C) in June, to a moderately hot 79.5°F (26.4°C). Weather in July »

August, the last month of the summer, in Lewistown, is also a moderately hot month, with temperature in the range of an average high of 79.9°F (26.6°C) and an average low of 49.3°F (9.6°C). With an average high-temperature of 79.9°F (26.6°C) and an average low-temperature of 49.3°F (9.6°C), August is the warmest month. Weather in August »

September, the first month of the autumn, in Lewistown, is still a pleasant month, with average temperature varying between 40.5°F (4.7°C) and 68.7°F (20.4°C). In Lewistown, the average high-temperature drops, from a moderately hot 79.9°F (26.6°C) in August, to a pleasant 68.7°F (20.4°C). Weather in September »

October, the same as September, in Lewistown, Montana, is a moderate autumn month, with average temperature fluctuating between 31.1°F (-0.5°C) and 57.4°F (14.1°C). In Lewistown, the average high-temperature in October drops, from a pleasant 68.7°F (20.4°C) in September, to a mild 57.4°F (14.1°C). Weather in October »

November, the last month of the autumn, in Lewistown, is also a wintry month, with average temperature fluctuating between 20.1°F (-6.6°C) and 42.1°F (5.6°C). In Lewistown, the average high-temperature significantly decreases, from a moderate 57.4°F (14.1°C) in October, to a wintry 42.1°F (5.6°C). Weather in November »

The first month of the winter, December, is also a wintry month in Lewistown, Montana, with average temperature ranging between min 12.6°F (-10.8°C) and max 34.2°F (1.2°C). In December, the average high-temperature marginally drops, from a wintry 42.1°F (5.6°C) in November, to a still cold 34.2°F (1.2°C). Weather in December »

What is the coldest month in Lewistown?

With an average high-temperature of 31.8°F (-0.1°C) and an average low-temperature of 10.6°F (-11.9°C), January is the coldest month.

How much does it rain in Lewistown?

In Lewistown, Montana, during the entire year, the rain falls for 92 days and collects up to 17.9" (453.5mm) of precipitation.

What is the month with the least sunshine in Lewistown?

Months with the least sunshine are January, November and December, with an average of 4h of sunshine.

When is the lowest UV index in Lewistown?

Months with the lowest UV index in Lewistown are January, November and December, with an average maximum UV index of 1.

What is the driest month in Lewistown?

February is the month with the least rainfall in Lewistown. Rain falls for 7 days and accumulates 0.6" (14.5mm) of precipitation.

What is the rainiest month in Lewistown?

The month with the most rainfall in Lewistown, Montana, is June when the rain falls for 10 days and typically aggregates up to 2.9" (74.4mm) of precipitation.

When are the longest days in Lewistown?

The month with the longest days is June, with an average of 15.8h of daylight.

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

Months with the highest UV index are June and July, with an average maximum UV index of 8.

What month has the most sunshine in Lewistown?

With an average of 12h of sunshine, July has the most sunshine of the year.

What is the warmest month in Lewistown?

The warmest month in Lewistown is August, with an average high-temperature of 79.9°F (26.6°C) and an average low-temperature of 49.3°F (9.6°C).

What is the month with the shortest days in Lewistown?

December has the shortest days of the year in Lewistown, with an average of 8.6h of daylight.
Average temperature - Lewistown, MT
Average rainfall - Lewistown, MT
Average rainfall days - Lewistown, MT
Average daylight / Average sunshine - Lewistown, MT