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

Monthly weather forecast and climate
Boulder, MT

January, like December, in Boulder, Montana, is a wintry winter month, with average temperature ranging between min 9°F (-12.8°C) and max 33.1°F (0.6°C). January is the coldest month, with an average high-temperature of 33.1°F (0.6°C) and an average low-temperature of 9°F (-12.8°C). Weather in January »
The last month of the winter, February, is also a wintry month in Boulder, Montana, with average temperature fluctuating between 14°F (-10°C) and 39°F (3.9°C). In Boulder, the average high-temperature marginally rises, from a wintry 33.1°F (0.6°C) in January, to a still cold 39°F (3.9°C). Weather in February »

March, the first month of the spring, in Boulder, is a frosty month, with average temperature varying between 19°F (-7.2°C) and 44.1°F (6.7°C). In March, the average high-temperature is relatively the same as in February - a chilly 44.1°F (6.7°C). Weather in March »

April in Boulder, Montana, is a fresh spring month, with temperature in the range of an average low of 27°F (-2.8°C) and an average high of 55°F (12.8°C). In April, the average high-temperature increases, from a chilly 44.1°F (6.7°C) in March, to a cool 55°F (12.8°C). Weather in April »

May, the last month of the spring, in Boulder, is a comfortable month, with temperature in the range of an average high of 64°F (17.8°C) and an average low of 35.1°F (1.7°C). In Boulder, the average high-temperature in May increases, from a cool 55°F (12.8°C) in April, to an enjoyable 64°F (17.8°C). Weather in May »

The first month of the summer, June, is an agreeable month in Boulder, Montana, with average temperature varying between 73°F (22.8°C) and 43°F (6.1°C). In June, the average high-temperature rises, from an enjoyable 64°F (17.8°C) in May, to an agreeable 73°F (22.8°C). Weather in June »

July in Boulder, Montana, is a moderately hot summer month, with average temperature ranging between max 82°F (27.8°C) and min 48°F (8.9°C). The warmest months are July and August, with an average high-temperature of 82°F (27.8°C). Weather in July »

August, the last month of the summer, in Boulder, is another warm month, with temperature in the range of an average high of 82°F (27.8°C) and an average low of 46°F (7.8°C). The warmest months are July and August, with an average high-temperature of 82°F (27.8°C). Weather in August »

The first month of the autumn, September, is also an agreeable month in Boulder, Montana, with average temperature varying between 37°F (2.8°C) and 71.1°F (21.7°C). In September, the average high-temperature decreases, from a moderately hot 82°F (27.8°C) in August, to an agreeable 71.1°F (21.7°C). Weather in September »

October, the same as September, in Boulder, Montana, is a moderate autumn month, with average temperature ranging between min 28°F (-2.2°C) and max 60.1°F (15.6°C). In October, the average high-temperature decreases, from an agreeable 71.1°F (21.7°C) in September, to a mild 60.1°F (15.6°C). Weather in October »

November, the last month of the autumn, in Boulder, is another chilly month, with average temperature ranging between max 43°F (6.1°C) and min 18°F (-7.8°C). In November, the average high-temperature plummets, from a mild 60.1°F (15.6°C) in October, to a frosty 43°F (6.1°C). Weather in November »

The first month of the winter, December, is still a cold month in Boulder, Montana, with average temperature ranging between max 35.1°F (1.7°C) and min 10.9°F (-11.7°C). In December, the average high-temperature slightly decreases, from a chilly 43°F (6.1°C) in November, to a wintry 35.1°F (1.7°C). Weather in December »

What is the coldest month in Boulder?

The coldest month in Boulder, Montana, is January, with an average high-temperature of 33.1°F (0.6°C) and an average low-temperature of 9°F (-12.8°C).

How much does it rain in Boulder?

Throughout the year, in Boulder, 11.3" (286.9mm) of rain is accumulated.

What is the driest month in Boulder?

The month with the least rainfall is February when 0.3" (7.6mm) of precipitation is typically aggregated.

What is the wettest month in Boulder?

June is the month with the most rainfall in Boulder, with 2.1" (53.3mm) of accumulated precipitation.

When are the longest days in Boulder?

June has the longest days of the year, with an average of 15.7h of daylight.

What are the warmest months in Boulder?

July and August, with an average high-temperature of 82°F (27.8°C), are warmest months in Boulder.

What is the month with the shortest days in Boulder?

December has the shortest days of the year in Boulder, with an average of 8.7h of daylight.
Average rainfall - Boulder, MT
Average daylight - Boulder, MT

The month with the longest days is June (Average daylight: 15.7h).
The month with shortest days is December (Average daylight: 8.7h).