Monthly weather forecast and climate
Westby, MT

Weather in January

January, the same as December, in Westby, Montana, is a freezing cold winter month, with average temperature fluctuating between 7.2°F (-13.8°C) and 20.7°F (-6.3°C). In January, the average high-temperature is relatively the same as in December - a still subzero cold 20.7°F (-6.3°C). Weather in January »

Weather in February

The last month of the winter, February, is another freezing cold month in Westby, Montana, with average temperature fluctuating between 19.8°F (-6.8°C) and 6.3°F (-14.3°C). The coldest month is February, with an average high-temperature of 19.8°F (-6.8°C) and an average low-temperature of 6.3°F (-14.3°C). Weather in February »

Weather in March

March, the first month of the spring, in Westby, is a wintry month, with average temperature fluctuating between 35.4°F (1.9°C) and 20.8°F (-6.2°C). In March, the average high-temperature increases considerably, from a freezing cold 19.8°F (-6.8°C) in February, to a wintry 35.4°F (1.9°C). Weather in March »

Weather in April

April is a fresh spring month in Westby, Montana, with average temperature ranging between max 50.2°F (10.1°C) and min 33.6°F (0.9°C). In April, the average high-temperature significantly increases, from a cold 35.4°F (1.9°C) in March, to a cool 50.2°F (10.1°C). Weather in April »

Weather in May

May, the last month of the spring, in Westby, is a comfortable month, with average temperature varying between 46.4°F (8°C) and 64.2°F (17.9°C). In Westby, the average high-temperature rises, from a fresh 50.2°F (10.1°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 moderately hot month in Westby, Montana, with average temperature ranging between min 55.2°F (12.9°C) and max 74.1°F (23.4°C). In June, the average high-temperature rises, from a comfortable 64.2°F (17.9°C) in May, to a warm 74.1°F (23.4°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Westby, Montana, with average temperature fluctuating between 61°F (16.1°C) and 82°F (27.8°C). With an average high-temperature of 82°F (27.8°C) and an average low-temperature of 61°F (16.1°C), July is the warmest month. In July, the average heat index is evaluated at 82.8°F (28.2°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Westby, Montana, with average temperature ranging between min 60.6°F (15.9°C) and max 81.3°F (27.4°C). In August, the average high-temperature is practically the same as in July - a still moderately hot 81.3°F (27.4°C). Weather in August »

Weather in September

September, the first month of the autumn, in Westby, is still a pleasant month, with temperature in the range of an average low of 52.3°F (11.3°C) and an average high of 70°F (21.1°C). In September, the average high-temperature decreases, from a moderately hot 81.3°F (27.4°C) in August, to an agreeable 70°F (21.1°C). Weather in September »

Weather in October

October, the same as September, is a cool autumn month in Westby, Montana, with average temperature varying between 52.7°F (11.5°C) and 37.9°F (3.3°C). In October, the average high-temperature significantly decreases, from an agreeable 70°F (21.1°C) in September, to a fresh 52.7°F (11.5°C). Weather in October »

Weather in November

November, the last month of the autumn, in Westby, is another cold month, with temperature in the range of an average high of 36.3°F (2.4°C) and an average low of 23.7°F (-4.6°C). In Westby, the average high-temperature significantly decreases, from a fresh 52.7°F (11.5°C) in October, to a cold 36.3°F (2.4°C). Weather in November »

Weather in December

December, the first month of the winter, in Westby, is still a freezing cold month, with temperature in the range of an average low of 10°F (-12.2°C) and an average high of 21.9°F (-5.6°C). In December, the average high-temperature significantly decreases, from a cold 36.3°F (2.4°C) in November, to a subzero cold 21.9°F (-5.6°C). Weather in December »
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FAQ

What is the most humid month in Westby?

Months with the highest humidity in Westby are January and February, with an average relative humidity of 88%.

How many days does it rain in Westby?

In Westby, Montana, during the entire year, the rain falls for 93.3 days and collects up to 12.01" (305mm) of precipitation.

When does it snow in Westby?

January through May, October through December are months with snowfall in Westby, Montana.

How many days does it snow in Westby?

In Westby, Montana, during the entire year, snow falls for 66.5 days, and aggregates up to 19.02" (483mm) of snow.

What is the coldest month in Westby?

With an average high-temperature of 19.8°F (-6.8°C) and an average low-temperature of 6.3°F (-14.3°C), February is the coldest month in Westby, Montana.

What is the driest month in Westby?

The month with the least rainfall is February when the rain falls for 2.6 days and typically collects 0.47" (12mm) of precipitation.

What is the month with the least sunshine in Westby?

February has the least sunshine of the year in Westby, Montana, with an average of 3.9h of sunshine.

When is the lowest UV index in Westby?

The month with the lowest UV index in Westby, Montana, is February, with an average maximum UV index of 1.

What is the rainiest month in Westby?

June is the month with the most rainfall in Westby. Rain falls for 13.9 days and accumulates 2.17" (55mm) of precipitation.

When it does not snow in Westby?

In Westby snow does not fall in June through September.

When are the longest days in Westby?

June has the longest days of the year, with an average of 16.1h of daylight.

What is the warmest month in Westby?

The warmest month in Westby, Montana, is July, with an average high-temperature of 82°F (27.8°C) and an average low-temperature of 61°F (16.1°C).

What month has the most sunshine in Westby?

July has the most sunshine of the year in Westby, with an average of 11.7h of sunshine.

When is the highest UV index in Westby?

With an average maximum UV index of 6, July is the month with the highest UV index.

What is the least humid month in Westby?

August is the least humid month in Westby, with an average relative humidity of 46%.

When does it snow the most in Westby?

November is the month with the most snowfall in Westby, Montana. Snow falls for 7.6 days and accumulates 3.74" (95mm) of snow.

What is the month with the shortest days in Westby?

The month with the shortest days in Westby, Montana, is December, with an average of 8.3h of daylight.

Average pressure
Westby, MT

Average pressure - Westby, MT

The month with the highest atmospheric pressure is February (30.17").
The month with the lowest atmospheric pressure is June (29.83").

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Average wind speed
Westby, MT

Average wind speed - Westby, MT

The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is February (9.2mph).

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Average humidity
Westby, MT

Average humidity - Westby, MT

Months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is August (46%).

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Average rainfall
Westby, MT

Average rainfall - Westby, MT

The wettest month (with the highest rainfall) is June (2.17").
The driest month (with the least rainfall) is February (0.47").

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Average rainfall days
Westby, MT

Average rainfall days - Westby, MT

The month with the highest number of rainy days is June (13.9 days).
The month with the least rainy days is February (2.6 days).

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Average snowfall
Westby, MT

Average snowfall - Westby, MT

The month with the highest snowfall is November (3.74").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Westby, MT

Average snowfall days - Westby, MT

The month with the highest number of snowfall days is February (13.5 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Westby, MT

Average daylight / Average sunshine - Westby, MT

The month with the longest days is June (Average daylight: 16.1h).
The month with the shortest days is December (Average daylight: 8.3h).

The month with the most sunshine is July (Average sunshine: 11.7h).
The month with the least sunshine is February (Average sunshine: 3.9h).

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Average sunshine days
Westby, MT

Average sunshine days - Westby, MT

The month with the most sunshine days is August (20.1 days).
Months with the least sunshine days are February and June (13.8 days).

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Average visibility
Westby, MT

Average visibility - Westby, MT

Months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
Months with the lowest visibility are January, February, March and December (5mi).

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