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

Monthly weather forecast and climate
Boulder, WY

January, like December, is a freezing cold winter month in Boulder, Wyoming, with average temperature ranging between min 32°F (0°C) and max 25.2°F (-3.8°C). In Boulder, the average high-temperature is almost the same as in December - a still subzero cold 25.2°F (-3.8°C). Weather in January »

February, the last month of the winter, in Boulder, is also a subzero cold month, with average temperature fluctuating between 26.6°F (-3°C) and 32°F (0°C). In February, the average high-temperature is relatively the same as in January - a still subzero cold 26.6°F (-3°C). Weather in February »

The first month of the spring, March, is a wintry month in Boulder, Wyoming, with average temperature ranging between max 34.9°F (1.6°C) and min 32°F (0°C). In Boulder, Wyoming, the average high-temperature marginally rises, from a subzero cold 26.6°F (-3°C) in February, to a wintry 34.9°F (1.6°C). Weather in March »

April in Boulder, Wyoming, is a frosty spring month, with average temperature ranging between min 32°F (0°C) and max 45°F (7.2°C). In Boulder, the average high-temperature increases, from a cold 34.9°F (1.6°C) in March, to a chilly 45°F (7.2°C). Weather in April »

The last month of the spring, May, is a mild month in Boulder, Wyoming, with average temperature fluctuating between 56.7°F (13.7°C) and 32°F (0°C). In Boulder, Wyoming, the average high-temperature in May rises, from a chilly 45°F (7.2°C) in April, to a mild 56.7°F (13.7°C). Weather in May »

June, the first month of the summer, in Boulder, is an agreeable month, with average temperature varying between 69.6°F (20.9°C) and 32°F (0°C). In Boulder, the average high-temperature rises, from a moderate 56.7°F (13.7°C) in May, to an agreeable 69.6°F (20.9°C). Weather in June »

July is a moderately hot summer month in Boulder, Wyoming, with average temperature fluctuating between 32°F (0°C) and 78.4°F (25.8°C). The warmest month is July, with an average high-temperature of 78.4°F (25.8°C) and an average low-temperature of 32°F (0°C). Weather in July »

The last month of the summer, August, is another warm month in Boulder, Wyoming, with average temperature ranging between min 32°F (0°C) and max 76.6°F (24.8°C). In Boulder, the average high-temperature is almost the same as in July - a still moderately hot 76.6°F (24.8°C). Weather in August »

The first month of the autumn, September, is also an enjoyable month in Boulder, Wyoming, with average temperature ranging between max 67.3°F (19.6°C) and min 32°F (0°C). In September, the average high-temperature decreases, from a warm 76.6°F (24.8°C) in August, to an enjoyable 67.3°F (19.6°C). Weather in September »

October, the same as September, is a cool autumn month in Boulder, Wyoming, with average temperature fluctuating between 32°F (0°C) and 50°F (10°C). In October, the average high-temperature plummets, from a comfortable 67.3°F (19.6°C) in September, to a cool 50°F (10°C). Weather in October »

November, the last month of the autumn, in Boulder, is also a wintry month, with temperature in the range of an average low of 32°F (0°C) and an average high of 36.1°F (2.3°C). In November, the average high-temperature drops, from a fresh 50°F (10°C) in October, to a cold 36.1°F (2.3°C). Weather in November »

December, the first month of the winter, in Boulder, is also a subzero cold month, with average temperature fluctuating between 32°F (0°C) and 23.9°F (-4.5°C). December is the coldest month, with an average high-temperature of 23.9°F (-4.5°C) and an average low-temperature of 32°F (0°C). Weather in December »

How many days does it rain in Boulder?

In Boulder, during the entire year, the rain falls for 102.6 days and collects up to 10.75" (273mm) of precipitation.

When does it snow in Boulder?

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

How many days does it snow in Boulder?

Throughout the year, in Boulder, Wyoming, there are 86.8 snowfall days, and 41.77" (1061mm) of snow is accumulated.

What is the month with the least sunshine in Boulder?

The month with the least sunshine in Boulder is January, with an average of 6.3h of sunshine.

When is the lowest UV index in Boulder?

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

What is the most humid month in Boulder?

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

When does it snow the most in Boulder?

The month with the most snowfall is February when snow falls for 14.7 days and typically aggregates up to 7.32" (186mm) of snow.

What is the rainiest month in Boulder?

The month with the most rainfall in Boulder is May when the rain falls for 15.2 days and typically aggregates up to 1.73" (44mm) of precipitation.

When are the longest days in Boulder?

June has the longest days of the year in Boulder, Wyoming, with an average of 15.3h of daylight.

What is the warmest month in Boulder?

The warmest month in Boulder, Wyoming, is July, with an average high-temperature of 78.4°F (25.8°C) and an average low-temperature of 32°F (0°C).

When it does not snow in Boulder?

July and August are months without snowfall.

What is the month with the most sunshine in Boulder?

July and August, with an average of 11.9h of sunshine, are months with the most sunshine.

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

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

What is the least humid month in Boulder?

With an average relative humidity of 34%, August is the least humid month in Boulder, Wyoming.

What is the driest month in Boulder?

The month with the least rainfall is August when the rain falls for 7.1 days and typically collects 0.51" (13mm) of precipitation.

What is the coldest month in Boulder?

With an average high-temperature of 23.9°F (-4.5°C) and an average low-temperature of 32°F (0°C), December is the coldest month in Boulder.

What is the month with the shortest days in Boulder?

The month with the shortest days in Boulder, Wyoming, is December, with an average of 9.1h of daylight.
Average temperature - Boulder, WY

The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is December (23.9°F).

Months with the highest average low temperature are January, February, March, April, May, June, July, August, September, October, November and December (0°F).
Coldest months (with the lowest average low temperature) are January, February, March, April, May, June, July, August, September, October, November and December (0°F).

Average rainfall - Boulder, WY
Average rainfall days - Boulder, WY

The month with the highest number of rainy days is May (15.2 days).
The month with the lowest number of rainy days is January (5.5 days).

Average snowfall - Boulder, WY
Average snowfall days - Boulder, WY

The month with the highest number of snowfall days is March (15.7 days).
Months with the lowest number of snowfall days are July and August (0 days).

Average daylight / Average sunshine - Boulder, WY

The month with the longest days is June (Average daylight: 15.3h).
The month with shortest days is December (Average daylight: 9.1h).

Months with most sunshine are July and August (Average sunshine: 11.9h).
The month with least sunshine is January (Average sunshine: 6.3h).

Average UV index - Boulder, WY