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

Monthly weather forecast and climate
Boulder, CO

Front view of the old building of the University of Colorado in Boulder, Colorado
Front view of the old building of the University of Colorado in Boulder, Colorado
January, the same as December, in Boulder, Colorado, is a frosty winter month, with average temperature ranging between min 22.3°F (-5.4°C) and max 46.9°F (8.3°C). In January, the average high-temperature is essentially the same as in December - a still frosty 46.9°F (8.3°C). Weather in January »
The last month of the winter, February, is another chilly month in Boulder, Colorado, with average temperature ranging between min 23.2°F (-4.9°C) and max 48.4°F (9.1°C). In Boulder, the average high-temperature in February is essentially the same as in January - a still frosty 48.4°F (9.1°C). Weather in February »

March, the first month of the spring, in Boulder, is a mild month, with average temperature fluctuating between 55.9°F (13.3°C) and 29.1°F (-1.6°C). In Boulder, the average high-temperature in March slightly increases, from a frosty 48.4°F (9.1°C) in February, to a moderate 55.9°F (13.3°C). Weather in March »

April in Boulder, Colorado, is a comfortable spring month, with average temperature fluctuating between 63.3°F (17.4°C) and 35.6°F (2°C). In Boulder, Colorado, the average high-temperature slightly increases, from a moderate 55.9°F (13.3°C) in March, to a comfortable 63.3°F (17.4°C). Weather in April »

May, the last month of the spring, in Boulder, is a pleasant month, with average temperature ranging between max 72.1°F (22.3°C) and min 43.5°F (6.4°C). In May, the average high-temperature slightly increases, from a comfortable 63.3°F (17.4°C) in April, to a pleasant 72.1°F (22.3°C). Weather in May »

The first month of the summer, June, is a moderately hot month in Boulder, Colorado, with average temperature varying between 51.3°F (10.7°C) and 81.7°F (27.6°C). In June, the average high-temperature increases, from an agreeable 72.1°F (22.3°C) in May, to a moderately hot 81.7°F (27.6°C). Weather in June »

July is a tropical summer month in Boulder, Colorado, with temperature in the range of an average low of 57.4°F (14.1°C) and an average high of 87.6°F (30.9°C). July is the warmest month, with an average high-temperature of 87.6°F (30.9°C) and an average low-temperature of 57.4°F (14.1°C). Weather in July »

The last month of the summer, August, is another warm month in Boulder, Colorado, with average temperature varying between 85.3°F (29.6°C) and 56.1°F (13.4°C). In Boulder, Colorado, the average high-temperature in August is almost the same as in July - a moderately hot 85.3°F (29.6°C). Weather in August »

The first month of the autumn, September, is also a moderately hot month in Boulder, Colorado, with average temperature fluctuating between 77.7°F (25.4°C) and 48°F (8.9°C). In Boulder, Colorado, the average high-temperature slightly decreases, from a warm 85.3°F (29.6°C) in August, to a still moderately hot 77.7°F (25.4°C). Weather in September »

October, like September, in Boulder, Colorado, is another enjoyable autumn month, with average temperature varying between 65.8°F (18.8°C) and 37.8°F (3.2°C). In Boulder, the average high-temperature in October drops, from a warm 77.7°F (25.4°C) in September, to a comfortable 65.8°F (18.8°C). Weather in October »

November, the last month of the autumn, in Boulder, is also a fresh month, with average temperature fluctuating between 28.6°F (-1.9°C) and 53.8°F (12.1°C). In Boulder, the average high-temperature drops, from a comfortable 65.8°F (18.8°C) in October, to a cool 53.8°F (12.1°C). Weather in November »

The first month of the winter, December, is still a chilly month in Boulder, Colorado, with temperature in the range of an average low of 21.4°F (-5.9°C) and an average high of 45.3°F (7.4°C). December is the coldest month, with an average high-temperature of 45.3°F (7.4°C) and an average low-temperature of 21.4°F (-5.9°C). Weather in December »

How much does it rain in Boulder?

Throughout the year, there are 100.9 rainfall days, and 20.5" (520.9mm) of precipitation is accumulated.

What is the driest month in Boulder?

January is the month with the least rainfall. Rain falls for 5.3 days and accumulates 0.7" (18mm) of precipitation.

When does it snow in Boulder?

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

How many days does it snow in Boulder?

Throughout the year, in Boulder, Colorado, there are 35.2 snowfall days, and 87.6" (2225.1mm) of snow is accumulated.

When does it snow the most in Boulder?

March is the month with the most snowfall in Boulder. Snow falls for 6.4 days and accumulates 17.2" (436.9mm) of snow.

What is the wettest month in Boulder?

May is the month with the most rainfall in Boulder, Colorado. Rain falls for 12.1 days and accumulates 2.8" (71.4mm) of precipitation.

When are the longest days in Boulder?

June has the longest days of the year in Boulder, Colorado, with an average of 15h of daylight.

What is the warmest month in Boulder?

The warmest month in Boulder, Colorado, is July, with an average high-temperature of 87.6°F (30.9°C) and an average low-temperature of 57.4°F (14.1°C).

What is the coldest month in Boulder?

With an average high-temperature of 45.3°F (7.4°C) and an average low-temperature of 21.4°F (-5.9°C), December is the coldest month in Boulder, Colorado.

What is the month with the shortest days in Boulder?

With an average of 9.4h of daylight, December has the shortest days of the year.
Average temperature - Boulder, CO
Average rainfall - Boulder, CO
Average rainfall days - Boulder, CO

The month with the highest number of rainy days is May (12.1 days).
The month with the lowest number of rainy days is January (5.3 days).

Average snowfall - Boulder, CO
Average snowfall days - Boulder, CO

The month with the highest number of snowfall days is March (6.4 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

Average daylight - Boulder, CO