Climate and monthly weather forecast
Roundup, MT

Weather in January

January, the same as December, in Roundup, Montana, is another subzero cold winter month, with an average temperature varying between 18.5°F (-7.5°C) and 31.8°F (-0.1°C). In January, the average high-temperature is practically the same as in December - a still subzero cold 31.8°F (-0.1°C). Weather in January »

Weather in February

February, the last month of the winter in Roundup, is a cold month, with an average temperature varying between 32.5°F (0.3°C) and 18°F (-7.8°C). In February, the average high-temperature is practically the same as in January - a cold 32.5°F (0.3°C). Weather in February »

Weather in March

The first month of the spring, March, is a chilly month in Roundup, Montana, with temperature in the range of an average high of 45°F (7.2°C) and an average low of 29.3°F (-1.5°C). In Roundup, the average high-temperature in March increases from a cold 32.5°F (0.3°C) in February to a frosty 45°F (7.2°C). Weather in March »

Weather in April

April in Roundup, Montana, is a cool spring month, with an average temperature ranging between min 36.3°F (2.4°C) and max 53.8°F (12.1°C). In April, the average high-temperature marginally rises from a chilly 45°F (7.2°C) in March to a cool 53.8°F (12.1°C). Weather in April »

Weather in May

The last month of the spring, May, is a comfortable month in Roundup, Montana, with an average temperature varying between 45.7°F (7.6°C) and 64.2°F (17.9°C). In Roundup, the average high-temperature in May rises from a fresh 53.8°F (12.1°C) in April to a comfortable 64.2°F (17.9°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Roundup, Montana, with an average temperature varying between 75.2°F (24°C) and 54.5°F (12.5°C). In June, the average high-temperature increases from an enjoyable 64.2°F (17.9°C) in May to a moderately hot 75.2°F (24°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Roundup, Montana, with an average temperature varying between 62.4°F (16.9°C) and 84.7°F (29.3°C). With an average high-temperature of 84.7°F (29.3°C) and an average low-temperature of 62.4°F (16.9°C), July is the warmest month. In July, the average heat index is evaluated at 84.2°F (29°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Roundup, Montana, with temperature in the range of an average low of 61.5°F (16.4°C) and an average high of 82.8°F (28.2°C). In Roundup, the average high-temperature in August is practically the same as in July - a still moderately hot 82.8°F (28.2°C). Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Roundup, Montana, with an average temperature ranging between min 53.2°F (11.8°C) and max 72.7°F (22.6°C). In September, the average high-temperature decreases from a warm 82.8°F (28.2°C) in August to a pleasant 72.7°F (22.6°C). Weather in September »

Weather in October

October, like September, is another mild autumn month in Roundup, Montana, with an average temperature ranging between min 39.7°F (4.3°C) and max 56.3°F (13.5°C). In October, the average high-temperature significantly decreases from an agreeable 72.7°F (22.6°C) in September to a moderate 56.3°F (13.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Roundup, is another chilly month, with an average temperature varying between 28.8°F (-1.8°C) and 43.2°F (6.2°C). In Roundup, the average high-temperature in November decreases from a moderate 56.3°F (13.5°C) in October to a chilly 43.2°F (6.2°C). Weather in November »

Weather in December

The first month of the winter, December, is still a freezing cold month in Roundup, Montana, with an average temperature ranging between max 31.1°F (-0.5°C) and min 18.5°F (-7.5°C). December is the coldest month, with an average high-temperature of 31.1°F (-0.5°C) and an average low-temperature of 18.5°F (-7.5°C). Weather in December »
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FAQ

What is the most humid month in Roundup?

The most humid month is January, with an average relative humidity of 77%.

What is the driest month in Roundup?

The month with the least rainfall in Roundup is January, when the rain falls for 5.6 days and typically collects 0.55" (14mm) of precipitation.

How much does it rain in Roundup?

Throughout the year, there are 114.3 rainfall days, and 12.13" (308mm) of precipitation is accumulated.

When does it snow in Roundup?

January through May, September through December are months with snowfall in Roundup, Montana.

How many days does it snow in Roundup?

Throughout the year, in Roundup, Montana, there are 53.5 snowfall days, and 18.58" (472mm) of snow is accumulated.

When does it snow the most in Roundup?

February is the month with the most snowfall. Snow falls for 11.1 days and accumulates 3.78" (96mm) of snow.

What is the month with the least sunshine in Roundup?

The months with the least sunshine in Roundup are February and December, with an average of 5.2h of sunshine.

When is Daylight Saving Time (DST) in Roundup?

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 Roundup?

May is the month with the most rainfall in Roundup. Rain falls for 15.6 days and accumulates 1.97" (50mm) of precipitation.

When it does not snow in Roundup?

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

When are the longest days in Roundup?

The month with the longest days in Roundup, Montana, is June, with an average of 15h and 45min of daylight.

What is the warmest month in Roundup?

The warmest month is July, with an average high-temperature of 84.7°F (29.3°C) and an average low-temperature of 62.4°F (16.9°C).

What month has the most sunshine in Roundup?

July has the most sunshine of the year in Roundup, with an average of 11.8h of sunshine.

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

With an average maximum UV index of 7, July is the month with the highest UV index in Roundup, Montana.

What is the least humid month in Roundup?

August is the least humid month in Roundup, with an average relative humidity of 39%.

What is the coldest month in Roundup?

With an average high-temperature of 31.1°F (-0.5°C) and an average low-temperature of 18.5°F (-7.5°C), December is the coldest month in Roundup, Montana.

What is the month with the shortest days in Roundup?

December has the shortest days of the year in Roundup, Montana, with an average of 8h and 40min of daylight.

What is the month with the lowest UV index in Roundup?

The month with the lowest UV index is December, with an average maximum UV index of 1.

Average temperature
Roundup, MT

Average temperature - Roundup, MT

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (31.1°F).

The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is February (18°F).

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Average pressure
Roundup, MT

Average pressure - Roundup, MT

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

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Average wind speed
Roundup, MT

Average wind speed - Roundup, MT

The windiest month (with the highest average wind speed) is January (11.2mph).
The calmest months (with the lowest average wind speed) are July and August (8.5mph).

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Average rainfall
Roundup, MT

Average rainfall - Roundup, MT

The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is January (0.55").

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Average rainfall days
Roundup, MT

Average rainfall days - Roundup, MT

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (4.6 days).

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Average snowfall
Roundup, MT

Average snowfall - Roundup, MT

The month with the highest snowfall is February (3.78").
The months with the least snowfall are June, July and August (0").

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Average snowfall days
Roundup, MT

Average snowfall days - Roundup, MT

The month with the highest number of snowfall days is February (11.1 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight / Average sunshine
Roundup, MT

Average daylight / Average sunshine - Roundup, MT

The month with the longest days is June (Average daylight: 15h and 45min).
The month with the shortest days is December (Average daylight: 8h and 40min).

The month with the most sunshine is July (Average sunshine: 11.8h).
The months with the least sunshine are February and December (Average sunshine: 5.2).

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Average sunshine days
Roundup, MT

Average sunshine days - Roundup, MT

The month with the most sunshine days is September (19.5 days).
The month with the least sunshine days is April (12.8 days).

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Average visibility
Roundup, MT

Average visibility - Roundup, MT

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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