October weather forecast and climate
Roy, MT

October, the same as September, is a cool autumn month in Roy, Montana, with temperature in the range of an average high of 52.2°F (11.2°C) and an average low of 35.1°F (1.7°C).

Temperature

In Roy, the average high-temperature significantly decreases, from a comfortable 67.5°F (19.7°C) in September, to a fresh 52.2°F (11.2°C). In Roy, the average low-temperature is 35.1°F (1.7°C).

Humidity

In October, the average relative humidity is 62%.

Rainfall

In October, the rain falls for 9.5 days. Throughout October, 1.22" (31mm) of precipitation is accumulated. In Roy, during the entire year, the rain falls for 126.2 days and collects up to 17.83" (453mm) of precipitation.

Snowfall

Months with snowfall in Roy are January through June, September through December. In Roy, during October, snow falls for 6.1 days and regularly aggregates up to 4.61" (117mm) of snow. Throughout the year, in Roy, there are 83.4 snowfall days, and 45.51" (1156mm) of snow is accumulated.

Daylight

In October, the average length of the day in Roy is 10.8h.

Sunshine

In October, the average sunshine in Roy is 6.5h.

UV index

January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Roy. A UV Index reading of 2, and below, represents a minimal health hazard from the exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 2 transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in October in Roy?

In October, in Roy, Montana, the average high-temperature is 52.2°F (11.2°C), and the average low-temperature is 35.1°F (1.7°C).

What is the average humidity in October in Roy?

The average relative humidity in October in Roy, Montana, is 62%.

How much does it rain in Roy in October?

In Roy, Montana, in October, it is raining for 9.5 days, with typically 1.22" (31mm) of accumulated precipitation.

How much does it snow in Roy in October?

In October, in Roy, Montana, it is snowing for 6.1 days. Throughout October, 4.61" (117mm) of snow is accumulated.

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

In October, the average length of the day in Roy, Montana, is 10.8h.

How many hours of sunshine does Roy have in October?

In October, the average sunshine is 6.5h.

What are the months 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 UV index reading in October in Roy?

In Roy, the average daily maximum UV index in October is 2. A UV Index of 2, and less, symbolizes a low health threat from unsafe exposure to the Sun's UV rays.
Average temperature in October - Roy, MT
  • Average high temperature in October: 11.2°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 October: 1.7°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 October - Roy, MT
  • Average pressure in October: 1015.7mbar

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 October - Roy, MT
  • Average wind speed in October: 15.9km/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 October - Roy, MT
  • Average humidity in October: 62%

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

Average rainfall in October - Roy, MT
  • Average rainfall in October: 31mm

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

Average rainfall days in October - Roy, MT
  • Average rainfall days in October: 9.5 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 October - Roy, MT
  • Average snowfall in October: 117mm

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

Average snowfall days in October - Roy, MT
  • Average snowfall days in October: 6.1 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 October / Average sunshine in October - Roy, MT
  • Average daylight in October: 10.8h

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 October: 6.5h

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 sunshine days in October - Roy, MT
  • Average sunshine days in October: 15.3 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 October - Roy, MT
  • Average UV index in October: 2

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 October - Roy, MT
  • Average cloud cover in October: 30

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 October - Roy, MT
  • Average visibility in October: 9km

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).