May weather forecast
Columbia Falls, MT

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Weather in May

In May, the weather in Columbia Falls, Montana, enjoys substantial warmth and sunshine, marking a distinct departure from the cool temperatures of April. There is a meager trace of snowfall, at just 0.55" (14mm), a significant drop from the 2.09" (53mm) observed in April. The days extend further, providing more sunlight and allowing for an array of outdoor activities. As the weather warms up in June, expect even longer sunshine hours, less rain, and an increased UV index. Therefore, May is seen as the beginning of a vibrant summer period, welcoming residents and visitors to bask under the Columbia Falls sun.

Temperature

An upsurge in temperatures occurs as April gives way to May, with average highs shifting from a frosty 46.6°F (8.1°C) to a refreshing 59.5°F (15.3°C). May nights experience a distinct temperature drop from the daily highs, with an average low-temperature of 35.2°F (1.8°C).

Humidity

The average relative humidity in May in Columbia Falls is 68%.

Rainfall

In Columbia Falls, in May, it is raining for 13.8 days, with typically 1.1" (28mm) of accumulated precipitation. Throughout the year, in Columbia Falls, there are 126.4 rainfall days, and 11.22" (285mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Columbia Falls are January through May, September through December. May is the last month it regularly snows. During 1.5 snowfall days, in May, Columbia Falls aggregates 0.55" (14mm) of snow. Throughout the year, there are 97 snowfall days, and 33.86" (860mm) of snow is accumulated.

Daylight

In May, the average length of the day in Columbia Falls, Montana, is 15h and 15min.
On the first day of May, sunrise is at 6:15 am and sunset at 8:51 pm. On the last day of the month, sunrise is at 5:39 am and sunset at 9:29 pm MDT.

Sunshine

The average sunshine in May is 10.4h.

UV index

In Columbia Falls, the average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index, 4 in May, converts into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
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Frequently asked questions

What is the usual temperature for Columbia Falls in May?

During May, Columbia Falls experiences an average high-temperature of 59.5°F (15.3°C) and a low-temperature of 35.2°F (1.8°C).

What is the average humidity in May in Columbia Falls?

In May, the average relative humidity is 68%.

How many days does it rain in May in Columbia Falls?

In May, the rain falls for 13.8 days. Throughout May, 1.1" (28mm) of precipitation is accumulated.

What is the last month it snows in Columbia Falls?

May is the last month it regularly snows. During 1.5 snowfall days, in May, Columbia Falls aggregates 0.55" (14mm) of snow.

How many hours of daylight does Columbia Falls have in May?

The average day length in May is 15h and 15min.

When is the sunrise / sunset in May in Columbia Falls?

On the first day of May, sunrise is at 6:15 am and sunset at 8:51 pm. On the last day of the month, sunrise is at 5:39 am and sunset at 9:29 pm MDT.

How many hours of sunshine does Columbia Falls have in May?

In Columbia Falls, Montana, the average sunshine duration in May is 10.4h.

What is the UV index reading in May in Columbia Falls?

In Columbia Falls, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Columbia Falls, MT

Average temperature in May - Columbia Falls, MT
  • Average high temperature in May: 59.5°F

The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is December (25.7°F).

  • Average low temperature in May: 35.2°F

The month with the highest average low temperature is August (45.5°F).
The coldest month (with the lowest average low temperature) is February (13.5°F).

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Average pressure in May
Columbia Falls, MT

Average pressure in May - Columbia Falls, MT
  • Average pressure in May: 29.96"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in May
Columbia Falls, MT

Average wind speed in May - Columbia Falls, MT
  • Average wind speed in May: 4.4mph

The windiest month (with the highest average wind speed) is April (4.6mph).
The calmest months (with the lowest average wind speed) are August and December (3.7mph).

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Average humidity in May
Columbia Falls, MT

Average humidity in May - Columbia Falls, MT
  • Average humidity in May: 68%

The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is August (55%).

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Average rainfall in May
Columbia Falls, MT

Average rainfall in May - Columbia Falls, MT
  • Average rainfall in May: 1.1"

The wettest month (with the highest rainfall) is June (1.42").
The driest month (with the least rainfall) is August (0.43").

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Average rainfall days in May
Columbia Falls, MT

Average rainfall days in May - Columbia Falls, MT
  • Average rainfall days in May: 13.8 days

The month with the highest number of rainy days is April (15.8 days).
The month with the least rainy days is August (6.3 days).

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Average snowfall in May
Columbia Falls, MT

Average snowfall in May - Columbia Falls, MT
  • Average snowfall in May: 0.55"

The month with the highest snowfall is January (7.72").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in May
Columbia Falls, MT

Average snowfall days in May - Columbia Falls, MT
  • Average snowfall days in May: 1.5 days

The month with the highest number of snowfall days is December (19.1 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight in May /
Average sunshine in May
Columbia Falls, MT

Average daylight in May / Average sunshine in May - Columbia Falls, MT
  • Average daylight in May: 15h and 1min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).

  • Average sunshine in May: 10h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

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Average sunshine days in May
Columbia Falls, MT

Average sunshine days in May - Columbia Falls, MT
  • Average sunshine days in May: 14.2 days

The month with the most sunshine days is July (21.5 days).
The month with the least sunshine days is March (7.7 days).

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Average UV index in May
Columbia Falls, MT

Average UV index in May - Columbia Falls, MT
  • Average UV index in May: 4

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).

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Average cloud cover in May
Columbia Falls, MT

Average cloud cover in May - Columbia Falls, MT
  • Average cloud cover in May: 33

The month with the most cloud cover is January (Cloud cover 65).
The months with the least cloud cover are July and August (Cloud cover 15).

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Average visibility in May
Columbia Falls, MT

Average visibility in May - Columbia Falls, MT
  • Average visibility in May: 6mi

The months with the highest visibility are May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).

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Columbia Falls, Montana, USA

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