Roy
Montana, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Roy, MT

January, like December, is a freezing cold winter month in Roy, Montana, with average temperature fluctuating between 16.9°F (-8.4°C) and 30.6°F (-0.8°C). In Roy, Montana, the average high-temperature is essentially the same as in December - a still subzero cold 30.6°F (-0.8°C). Weather in January »

February, the last month of the winter, in Roy, is also a subzero cold month, with temperature in the range of an average low of 15.3°F (-9.3°C) and an average high of 29.1°F (-1.6°C). February and December, with an average high-temperature of 29.1°F (-1.6°C), are the coldest months. Weather in February »

The first month of the spring, March, is a wintry month in Roy, Montana, with average temperature ranging between min 25.3°F (-3.7°C) and max 40.6°F (4.8°C). In March, the average high-temperature increases, from a subzero cold 29.1°F (-1.6°C) in February, to a cold 40.6°F (4.8°C). Weather in March »

April in Roy, Montana, is a frosty spring month, with average temperature ranging between max 47.8°F (8.8°C) and min 31.8°F (-0.1°C). In Roy, the average high-temperature marginally rises, from a cold 40.6°F (4.8°C) in March, to a frosty 47.8°F (8.8°C). Weather in April »

The last month of the spring, May, is a mild month in Roy, Montana, with temperature in the range of an average low of 40.1°F (4.5°C) and an average high of 58.5°F (14.7°C). In Roy, the average high-temperature in May rises, from a frosty 47.8°F (8.8°C) in April, to a moderate 58.5°F (14.7°C). Weather in May »

June, the first month of the summer, in Roy, is an agreeable month, with average temperature ranging between max 68.5°F (20.3°C) and min 47.8°F (8.8°C). In Roy, the average high-temperature rises, from a mild 58.5°F (14.7°C) in May, to an agreeable 68.5°F (20.3°C). Weather in June »

July in Roy, Montana, is a moderately hot summer month, with average temperature fluctuating between 54.3°F (12.4°C) and 78.8°F (26°C). July is the warmest month, with an average high-temperature of 78.8°F (26°C) and an average low-temperature of 54.3°F (12.4°C). Weather in July »

August, the last month of the summer, in Roy, is also a moderately hot month, with average temperature varying between 54.5°F (12.5°C) and 78.1°F (25.6°C). In Roy, Montana, the average high-temperature is practically the same as in July - a still moderately hot 78.1°F (25.6°C). Weather in August »

September, the first month of the autumn, in Roy, is still a comfortable month, with average temperature ranging between max 67.5°F (19.7°C) and min 47.1°F (8.4°C). In Roy, Montana, the average high-temperature drops, from a warm 78.1°F (25.6°C) in August, to a comfortable 67.5°F (19.7°C). Weather in September »

October, the same as September, is a cool autumn month in Roy, Montana, with average temperature fluctuating between 35.1°F (1.7°C) and 52.2°F (11.2°C). In October, the average high-temperature significantly decreases, from an enjoyable 67.5°F (19.7°C) in September, to a cool 52.2°F (11.2°C). Weather in October »

November, the last month of the autumn, in Roy, is also a wintry month, with average temperature fluctuating between 25.2°F (-3.8°C) and 39.2°F (4°C). In November, the average high-temperature drops, from a fresh 52.2°F (11.2°C) in October, to a cold 39.2°F (4°C). Weather in November »

December, the first month of the winter, in Roy, is still a freezing cold month, with average temperature varying between 16°F (-8.9°C) and 29.1°F (-1.6°C). February and December, with an average high-temperature of 29.1°F (-1.6°C), are the coldest months. Weather in December »

How much does it rain in Roy?

In Roy, Montana, during the entire year, the rain falls for 126.2 days and collects up to 17.83" (453mm) of precipitation.

When does it snow in Roy?

Months with snowfall in Roy, Montana, are January through June, September through December.

How many days does it snow in Roy?

Throughout the year, in Roy, there are 83.4 snowfall days, and 45.51" (1156mm) of snow is accumulated.

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

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

What is the coldest month in Roy?

February and December, with an average high-temperature of 29.1°F (-1.6°C), are the coldest months in Roy, Montana.

What is the most humid month in Roy?

February is the most humid month, with an average relative humidity of 79%.

What is the month with the least sunshine in Roy?

The month with the least sunshine in Roy, Montana, is February, with an average of 5.5h of sunshine.

When does it snow the most in Roy?

April is the month with the most snowfall. Snow falls for 10 days and accumulates 9.13" (232mm) of snow.

What is the wettest month in Roy?

May is the month with the most rainfall in Roy. Rain falls for 19.3 days and accumulates 3.39" (86mm) of precipitation.

When are the longest days in Roy?

With an average of 15.9h of daylight, June has the longest days of the year in Roy, Montana.

What is the warmest month in Roy?

July is the warmest month in Roy, Montana, with an average high-temperature of 78.8°F (26°C) and an average low-temperature of 54.3°F (12.4°C).

When it does not snow in Roy?

In Roy, Montana, snow does not fall in July and August.

What month has the most sunshine in Roy?

The month with the most sunshine is July, with an average of 11.8h of sunshine.

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

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

What is the least humid month in Roy?

With an average relative humidity of 47%, August is the least humid month.

What is the driest month in Roy?

December is the month with the least rainfall in Roy, Montana. Rain falls for 6 days and accumulates 0.71" (18mm) of precipitation.

What is the month with the shortest days in Roy?

December has the shortest days of the year, with an average of 8.5h of daylight.
Average temperature - Roy, MT
Average rainfall - Roy, MT
Average rainfall days - Roy, MT
Average snowfall days - Roy, MT

The month with the highest number of snowfall days is February (15.2 days).
Months with the least snowfall days are July and August (0 days).

Average daylight / Average sunshine - Roy, MT

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

The month with the most sunshine is July (Average sunshine: 11.8h).
The month with the least sunshine is February (Average sunshine: 5.5h).

Average UV index - Roy, MT