October weather forecast
Boulder, MT

Weather in October

October, like September, in Boulder, Montana, is another fresh autumn month, with temperature in the range of an average high of 50.9°F (10.5°C) and an average low of 31.3°F (-0.4°C).

Temperature

In Boulder, Montana, the average high-temperature in October significantly decreases from an enjoyable 67.5°F (19.7°C) in September to a fresh 50.9°F (10.5°C). The average low-temperature, in Boulder, is 31.3°F (-0.4°C).

Humidity

The average relative humidity in October in Boulder, Montana, is 65%.

Rainfall

In Boulder, during 11 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. Throughout the year, in Boulder, there are 133.7 rainfall days, and 16.38" (416mm) of precipitation is accumulated.

Snowfall

January through June, September through December are months with snowfall in Boulder. In Boulder, snow falls for 6.5 days, with typically accumulated 3.94" (100mm) of snow. In Boulder, Montana, during the entire year, snow falls for 105.8 days and aggregates up to 55.12" (1400mm) of snow.

Daylight

The average length of the day in October in Boulder is 10h and 53min.
On the first day of October in Boulder, sunrise is at 7:27 am and sunset at 7:09 pm. On the last day of the month, sunrise is at 8:08 am and sunset at 6:16 pm MDT.

Sunshine

In October, the average sunshine in Boulder is 7h.

UV index

In October, the average daily maximum UV index in Boulder is 2. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 2 in October interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in October in Boulder?

The average high-temperature, in October, in Boulder, Montana, is 50.9°F (10.5°C), while the average low-temperature is 31.3°F (-0.4°C).

What is the average humidity in October in Boulder?

The average relative humidity in October is 65%.

How many days does it rain in October in Boulder?

In Boulder, Montana, in October, it is raining for 11 days, with typically 1.06" (27mm) of accumulated precipitation.

How many days does it snow in October in Boulder?

In Boulder, in October, snow falls for 6.5 days, with typically accumulated 3.94" (100mm) of snow.

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

In October, the average day length is 10h and 53min.

When are sunrise and sunset in October in Boulder?

On the first day of October, sunrise is at 7:27 am and sunset at 7:09 pm. On the last day of the month, sunrise is at 8:08 am and sunset at 6:16 pm MDT.

How many hours of sunshine does Boulder have in October?

In Boulder, the average sunshine duration in October is 7h.

What is the UV index reading in October in Boulder?

The average daily maximum UV index in October in Boulder, Montana, is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in October
Boulder, MT

Average temperature in October - Boulder, MT
  • Average high temperature in October: 50.9°F

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is December (27°F).

  • Average low temperature in October: 31.3°F

The month with the highest average low temperature is August (48.6°F).
The coldest month (with the lowest average low temperature) is December (12.6°F).

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Average pressure in October
Boulder, MT

Average pressure in October - Boulder, MT
  • Average pressure in October: 30.05"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in October
Boulder, MT

Average wind speed in October - Boulder, MT
  • Average wind speed in October: 6.2mph

The windiest months (with the highest average wind speed) are January and November (6.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

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Average humidity in October
Boulder, MT

Average humidity in October - Boulder, MT
  • Average humidity in October: 65%

The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (46%).

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Average rainfall in October
Boulder, MT

Average rainfall in October - Boulder, MT
  • Average rainfall in October: 1.06"

The wettest month (with the highest rainfall) is June (2.68").
The driest month (with the least rainfall) is December (0.79").

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Average rainfall days in October
Boulder, MT

Average rainfall days in October - Boulder, MT
  • Average rainfall days in October: 11 days

The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is November (7.5 days).

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Average snowfall in October
Boulder, MT

Average snowfall in October - Boulder, MT
  • Average snowfall in October: 3.94"

The month with the highest snowfall is February (9.72").
The months with the least snowfall are July and August (0").

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Average snowfall days in October
Boulder, MT

Average snowfall days in October - Boulder, MT
  • Average snowfall days in October: 6.5 days

The month with the highest number of snowfall days is February (18 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight in October /
Average sunshine in October
Boulder, MT

Average daylight in October / Average sunshine in October - Boulder, MT
  • Average daylight in October: 10h and 53min

The month with the longest days is June (Average daylight: 15h and 43min).
The month with the shortest days is December (Average daylight: 8h and 41min).

  • Average sunshine in October: 7h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).

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Average sunshine days in October
Boulder, MT

Average sunshine days in October - Boulder, MT
  • Average sunshine days in October: 15 days

The month with the most sunshine days is September (17.9 days).
The month with the least sunshine days is February (8.5 days).

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Average UV index in October
Boulder, MT

Average UV index in October - Boulder, MT
  • Average UV index in October: 2

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).

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Average cloud cover in October
Boulder, MT

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

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 15).

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Average visibility in October
Boulder, MT

Average visibility in October - Boulder, MT
  • Average visibility in October: 6mi

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

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