Climate and monthly weather forecast
Casper, WY

The calm North Platte River flowing through downtown Casper in Wyoming
The calm North Platte River flowing through downtown Casper in Wyoming

Weather in January

January, like December, is a freezing cold winter month in Casper, Wyoming, with an average temperature varying between 28.9°F (-1.7°C) and 15.6°F (-9.1°C). In Casper, the average high-temperature in January is essentially the same as in December - a still freezing cold 28.9°F (-1.7°C). Weather in January »

Weather in February

February, the last month of the winter in Casper, is another freezing cold month, with an average temperature varying between 15.4°F (-9.2°C) and 30.7°F (-0.7°C). In Casper, the average high-temperature in February is essentially the same as in January - a still subzero cold 30.7°F (-0.7°C). Weather in February »

Weather in March

March, the first month of the spring in Casper, is a chilly month, with temperature in the range of an average low of 26.4°F (-3.1°C) and an average high of 43°F (6.1°C). In March, the average high-temperature increases from a freezing cold 30.7°F (-0.7°C) in February to a chilly 43°F (6.1°C). Weather in March »

Weather in April

April in Casper, Wyoming, is a fresh spring month, with an average temperature fluctuating between 50.7°F (10.4°C) and 32°F (0°C). In April, the average high-temperature slightly increases from a frosty 43°F (6.1°C) in March to a fresh 50.7°F (10.4°C). Weather in April »

Weather in May

May, the last month of the spring in Casper, is a comfortable month, with an average temperature ranging between min 41.2°F (5.1°C) and max 61.3°F (16.3°C). In May, the average high-temperature rises from a fresh 50.7°F (10.4°C) in April to a comfortable 61.3°F (16.3°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Casper, Wyoming, with an average temperature ranging between max 75.7°F (24.3°C) and min 52.3°F (11.3°C). In Casper, the average high-temperature in June significantly increases from a comfortable 61.3°F (16.3°C) in May to a warm 75.7°F (24.3°C). Weather in June »

Weather in July

July, like June, in Casper, Wyoming, is a moderately hot summer month, with an average temperature fluctuating between 83.5°F (28.6°C) and 59.5°F (15.3°C). July is the warmest month, with an average high-temperature of 83.5°F (28.6°C) and an average low-temperature of 59.5°F (15.3°C). Weather in July »

Weather in August

August, the last month of the summer in Casper, is also a moderately hot month, with temperature in the range of an average low of 58.6°F (14.8°C) and an average high of 81.3°F (27.4°C). In Casper, the average high-temperature in August is essentially the same as in July - a still warm 81.3°F (27.4°C). Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Casper, Wyoming, with an average temperature varying between 72.7°F (22.6°C) and 50.9°F (10.5°C). In Casper, the average high-temperature in September slightly decreases from a warm 81.3°F (27.4°C) in August to a pleasant 72.7°F (22.6°C). Weather in September »

Weather in October

October, the same as September, is another fresh autumn month in Casper, Wyoming, with an average temperature fluctuating between 36.5°F (2.5°C) and 54.3°F (12.4°C). In October, the average high-temperature plummets from an agreeable 72.7°F (22.6°C) in September to a fresh 54.3°F (12.4°C). Weather in October »

Weather in November

The last month of the autumn, November, is another cold month in Casper, Wyoming, with an average temperature varying between 26.1°F (-3.3°C) and 41.5°F (5.3°C). In November, the average high-temperature decreases from a fresh 54.3°F (12.4°C) in October to a cold 41.5°F (5.3°C). Weather in November »

Weather in December

The first month of the winter, December, is also a subzero cold month in Casper, Wyoming, with an average temperature fluctuating between 28.4°F (-2°C) and 15.1°F (-9.4°C). With an average high-temperature of 28.4°F (-2°C) and an average low-temperature of 15.1°F (-9.4°C), December is the coldest month. Weather in December »
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FAQ

What is the most humid month in Casper?

The most humid month is January, with an average relative humidity of 79%.

What is the driest month in Casper?

The months with the least rainfall in Casper, Wyoming, are January, August and September Rain falls for 3.6 days and accumulates 0.43" (11mm) of rain.

How many days does it rain in Casper?

Throughout the year, there are 91.6 rainfall days, and 9.69" (246mm) of precipitation is accumulated.

When does it snow in Casper?

January through May, September through December are months with snowfall in Casper, Wyoming.

How much does it snow in Casper?

In Casper, during the entire year, snow falls for 61.5 days and aggregates up to 32.13" (816mm) of snow.

What are the months with the lowest UV index in Casper?

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

What is the month with the least sunshine in Casper?

February has the least sunshine of the year in Casper, Wyoming, with an average of 6.1h of sunshine.

When is Daylight Saving Time (DST) in Casper?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, 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 rainiest month in Casper?

The month with the most rainfall in Casper, Wyoming, is May, when the rain falls for 14.1 days and typically aggregates up to 1.77" (45mm) of precipitation.

When it does not snow in Casper?

In Casper, snow does not fall in June through August.

When are the longest days in Casper?

The month with the longest days in Casper is June, with an average of 15h and 17min of daylight.

When is the highest UV index in Casper?

The months with the highest UV index in Casper are June through August, with an average maximum UV index of 6.

What is the warmest month in Casper?

The warmest month in Casper, Wyoming, is July, with an average high-temperature of 83.5°F (28.6°C) and an average low-temperature of 59.5°F (15.3°C).

What is the month with the most sunshine in Casper?

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

What is the least humid month in Casper?

With an average relative humidity of 37%, August is the least humid month.

What is the snowiest month in Casper?

The month with the most snowfall in Casper, Wyoming, is November, when snow falls for 7.1 days and typically aggregates up to 5.47" (139mm) of snow.

What is the coldest month in Casper?

The coldest month in Casper, Wyoming, is December, with an average high-temperature of 28.4°F (-2°C) and an average low-temperature of 15.1°F (-9.4°C).

What is the month with the shortest days in Casper?

The month with the shortest days in Casper is December, with an average of 9h and 5min of daylight.

Average temperature
Casper, WY

Average temperature - Casper, WY

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is December (28.4°F).

The month with the highest average low temperature is July (59.5°F).
The coldest month (with the lowest average low temperature) is December (15.1°F).

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Average pressure
Casper, WY

Average pressure - Casper, WY

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

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Average wind speed
Casper, WY

Average wind speed - Casper, WY

The windiest month (with the highest average wind speed) is January (12.1mph).
The calmest months (with the lowest average wind speed) are July and August (8.5mph).

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Average rainfall
Casper, WY

Average rainfall - Casper, WY

The wettest month (with the highest rainfall) is May (1.77").
The driest months (with the least rainfall) are January, August and September (0.43").

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Average rainfall days
Casper, WY

Average rainfall days - Casper, WY

The month with the highest number of rainy days is May (14.1 days).
The month with the least rainy days is January (3.6 days).

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Average snowfall
Casper, WY

Average snowfall - Casper, WY

The month with the highest snowfall is November (5.47").
The months with the least snowfall are June, July and August (0").

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Average snowfall days
Casper, WY

Average snowfall days - Casper, WY

The month with the highest number of snowfall days is February (11.2 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight / Average sunshine
Casper, WY

Average daylight / Average sunshine - Casper, 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 5min).

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

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Average sunshine days
Casper, WY

Average sunshine days - Casper, WY

The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is May (11.9 days).

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Average UV index
Casper, WY

Average UV index - Casper, WY

The months with the highest UV index are June, July and August (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
Casper, WY

Average visibility - Casper, WY

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

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