July weather forecast and climate
Roy, MT

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).

Temperature

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).

Humidity

The average relative humidity in July is 51%.

Rainfall

In Roy, in July, it is raining for 11.2 days, with typically 1.06" (27mm) of accumulated precipitation. In Roy, during the entire year, the rain falls for 126.2 days and collects up to 17.83" (453mm) of precipitation.

Snowfall

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

Daylight

In July, the average length of the day in Roy is 15.5h.

Sunshine

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

UV index

The month with the highest UV index in Roy is July, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In July, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the warmest month in Roy?

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).

What is the temperature in July in Roy?

In Roy, in July, the average high-temperature is 78.8°F (26°C), and the average low-temperature is 54.3°F (12.4°C).

What is the average humidity in July in Roy?

The average relative humidity in July in Roy, Montana, is 51%.

How many days does it rain in July in Roy?

In July, in Roy, Montana, the rain falls for 11.2 days. Throughout July, 1.06" (27mm) of precipitation is accumulated.

Does it snow in Roy in July?

In July, in Roy, Montana, it doesn't snow. June is the latest month when it typically snows.

When it does not snow in Roy?

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

What is the average length of the day in July in Roy?

In July, the average length of the day is 15.5h.

What month has the most sunshine in Roy?

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

How many hours of sunshine does Roy have in July?

The average sunshine in July in Roy is 11.8h.

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 UV index intensity in July in Roy?

In July, the average daily maximum UV index in Roy, Montana, is 6. A UV Index value of 6 to 7 symbolizes a high health threat from unsafe exposure to the Sun's UV rays.
Average temperature in July - Roy, MT
  • Average high temperature in July: 26°C

The warmest month (with the highest average high temperature) is July (26°C).
Months with the lowest average high temperature are February and December (-1.6°C).

  • Average low temperature in July: 12.4°C

The month with the highest average low temperature is August (12.5°C).
The coldest month (with the lowest average low temperature) is February (-9.3°C).

Average pressure in July - Roy, MT
  • Average pressure in July: 1012.5mbar

The month with the highest atmospheric pressure is January (1020.3mbar).
The month with the lowest atmospheric pressure is June (1010.9mbar).

Average wind speed in July - Roy, MT
  • Average wind speed in July: 12.2km/h

The windiest months (with the highest average wind speed) are January, April and October (15.9km/h).
The calmest month (with the lowest average wind speed) is August (11.9km/h).

Average humidity in July - Roy, MT
  • Average humidity in July: 51%

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (47%).

Average rainfall in July - Roy, MT
  • Average rainfall in July: 27mm

The wettest month (with the highest rainfall) is May (86mm).
The driest month (with the least rainfall) is December (18mm).

Average rainfall days in July - Roy, MT
  • Average rainfall days in July: 11.2 days

The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (5.4 days).

Average snowfall in July - Roy, MT
  • Average snowfall in July: 0mm

The month with the highest snowfall is April (232mm).
Months with the least snowfall are July and August (0mm).

Average snowfall days in July - Roy, MT
  • Average snowfall days in July: 0 days

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 in July / Average sunshine in July - Roy, MT
  • Average daylight in July: 15.5h

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

  • Average sunshine in July: 11.8h

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 sunshine days in July - Roy, MT
  • Average sunshine days in July: 16.6 days

The month with the most sunshine days is September (19.3 days).
The month with the least sunshine days is April (8.3 days).

Average UV index in July - Roy, MT
  • Average UV index in July: 6

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

Average cloud cover in July - Roy, MT
  • Average cloud cover in July: 16

The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 16).

Average visibility in July - Roy, MT
  • Average visibility in July: 10km

Months with the highest visibility are June, July, August and September (10km).
Months with the lowest visibility are January, February, March, April, May, October, November and December (9km).