Climate and monthly weather forecast
Boulder, WY

Weather in January

January, like December, is another subzero cold winter month in Boulder, Wyoming, with an average temperature fluctuating between 25.2°F (-3.8°C) and 5.4°F (-14.8°C). In January, the average high-temperature is essentially the same as in December - a still freezing cold 25.2°F (-3.8°C). Weather in January »

Weather in February

The last month of the winter, February, is also a subzero cold month in Boulder, Wyoming, with temperature in the range of an average high of 26.6°F (-3°C) and an average low of 6.8°F (-14°C). In Boulder, the average high-temperature in February is essentially the same as in January - a still freezing cold 26.6°F (-3°C). Weather in February »

Weather in March

The first month of the spring, March, is a cold month in Boulder, Wyoming, with an average temperature ranging between max 34.9°F (1.6°C) and min 17.8°F (-7.9°C). In March, the average high-temperature slightly increases from a subzero cold 26.6°F (-3°C) in February to a wintry 34.9°F (1.6°C). Weather in March »

Weather in April

April is a chilly spring month in Boulder, Wyoming, with an average temperature ranging between max 45°F (7.2°C) and min 28.8°F (-1.8°C). In April, the average high-temperature rises from a wintry 34.9°F (1.6°C) in March to a frosty 45°F (7.2°C). Weather in April »

Weather in May

May, the last month of the spring in Boulder, is a mild month, with temperature in the range of an average low of 38.3°F (3.5°C) and an average high of 56.7°F (13.7°C). In May, the average high-temperature increases from a frosty 45°F (7.2°C) in April to a mild 56.7°F (13.7°C). Weather in May »

Weather in June

June, the first month of the summer in Boulder, is a pleasant month, with an average temperature varying between 69.6°F (20.9°C) and 47.5°F (8.6°C). In Boulder, the average high-temperature in June increases from a moderate 56.7°F (13.7°C) in May to an agreeable 69.6°F (20.9°C). Weather in June »

Weather in July

July in Boulder, Wyoming, is a moderately hot summer month, with an average temperature ranging between min 55.2°F (12.9°C) and max 78.4°F (25.8°C). July is the warmest month, with an average high-temperature of 78.4°F (25.8°C) and an average low-temperature of 55.2°F (12.9°C). Weather in July »

Weather in August

August, the last month of the summer in Boulder, is also a moderately hot month, with an average temperature fluctuating between 53.8°F (12.1°C) and 76.6°F (24.8°C). In August, the average high-temperature is relatively the same as in July - a still moderately hot 76.6°F (24.8°C). Weather in August »

Weather in September

September, the first month of the autumn in Boulder, is still a comfortable month, with an average temperature ranging between min 46.9°F (8.3°C) and max 67.3°F (19.6°C). In Boulder, Wyoming, the average high-temperature in September decreases from a moderately hot 76.6°F (24.8°C) in August to an enjoyable 67.3°F (19.6°C). Weather in September »

Weather in October

October, the same as September, is a cool autumn month in Boulder, Wyoming, with an average temperature fluctuating between 32.4°F (0.2°C) and 50°F (10°C). In October, the average high-temperature plummets from an enjoyable 67.3°F (19.6°C) in September to a cool 50°F (10°C). Weather in October »

Weather in November

November, the last month of the autumn in Boulder, is also a wintry month, with an average temperature fluctuating between 36.1°F (2.3°C) and 19.6°F (-6.9°C). In Boulder, Wyoming, the average high-temperature in November decreases from a cool 50°F (10°C) in October to a wintry 36.1°F (2.3°C). Weather in November »

Weather in December

The first month of the winter, December, is still a freezing cold month in Boulder, Wyoming, with an average temperature ranging between min 5.9°F (-14.5°C) and max 23.9°F (-4.5°C). The coldest month is December, with an average high-temperature of 23.9°F (-4.5°C) and an average low-temperature of 5.9°F (-14.5°C). Weather in December »
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FAQ

How much 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?

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

How much does it snow in Boulder?

In Boulder, during the entire year, snow falls for 86.8 days and aggregates up to 41.77" (1061mm) of snow.

What is the month with the least sunshine in Boulder?

With an average of 6.3h of sunshine, January has the least sunshine of the year in Boulder, Wyoming.

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 in Boulder.

What is the most humid month in Boulder?

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

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.

When is Daylight Saving Time (DST) in Boulder?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Boulder, Wyoming, 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 wettest month in Boulder?

May is the month with the most rainfall in Boulder, Wyoming. Rain falls for 15.2 days and accumulates 1.73" (44mm) of precipitation.

When are the longest days in Boulder?

June has the longest days of the year, with an average of 15h and 17min of daylight.

What is the warmest month in Boulder?

The warmest month is July, with an average high-temperature of 78.4°F (25.8°C) and an average low-temperature of 55.2°F (12.9°C).

When it does not snow in Boulder?

In Boulder, Wyoming, snow does not fall in July and August.

What is the month with the most sunshine in Boulder?

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

When is the highest UV index in Boulder?

The month with the highest UV index 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.

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 5.9°F (-14.5°C), December is the coldest month.

What is the month with the shortest days in Boulder?

With an average of 9h and 6min of daylight, December has the shortest days of the year in Boulder, Wyoming.

Average temperature
Boulder, WY

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).

The month with the highest average low temperature is July (55.2°F).
The coldest month (with the lowest average low temperature) is January (5.4°F).

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Average pressure
Boulder, WY

Average pressure - Boulder, WY

The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed
Boulder, WY

Average wind speed - Boulder, WY

The windiest month (with the highest average wind speed) is June (8.1mph).
The calmest month (with the lowest average wind speed) is December (5.8mph).

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Average rainfall
Boulder, WY

Average rainfall - Boulder, WY

The wettest month (with the highest rainfall) is May (1.73").
The driest month (with the least rainfall) is August (0.51").

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Average rainfall days
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 least rainy days is January (5.5 days).

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Average snowfall
Boulder, WY

Average snowfall - Boulder, WY

The month with the highest snowfall is February (7.32").
The months with the least snowfall are July and August (0").

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Average snowfall days
Boulder, WY

Average snowfall days - Boulder, WY

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

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Average daylight / Average sunshine
Boulder, WY

Average daylight / Average sunshine - Boulder, WY

The month with the longest days is June (Average daylight: 15h and 17min).
The month with the shortest days is December (Average daylight: 9h and 6min).

The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 6h and 18min).

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Average sunshine days
Boulder, WY

Average sunshine days - Boulder, WY

The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is May (9.7 days).

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Average UV index
Boulder, WY

Average UV index - Boulder, WY

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
Boulder, WY

Average visibility - Boulder, WY

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).

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