May weather forecast and climate
Columbia Falls, MT

May, the last month of the spring, in Columbia Falls, is a mild month, with average temperature ranging between min 35.2°F (1.8°C) and max 59.5°F (15.3°C).

Temperature

In Columbia Falls, the average high-temperature in May increases, from a frosty 46.6°F (8.1°C) in April, to a mild 59.5°F (15.3°C). In May, the average low-temperature is 35.2°F (1.8°C).

Humidity

The average relative humidity is 68%.

Rainfall

In Columbia Falls, during May, the rain falls for 13.8 days and regularly aggregates up to 1.1" (28mm) of precipitation. In Columbia Falls, Montana, during the entire year, the rain falls for 126.4 days and collects up to 11.22" (285mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Columbia Falls. May is the last month it regularly snows in Columbia Falls. During 1.5 snowfall days, in May, Columbia Falls aggregates 0.55" (14mm) of snow. In Columbia Falls, during the entire year, snow falls for 97 days, and aggregates up to 33.86" (860mm) of snow.

Daylight

In Columbia Falls, the average length of the day is 15.3h.

Sunshine

In Columbia Falls, Montana, the average sunshine 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 moderate health risk from the exposure to the Sun's UV radiation for the average person.
Note: In May, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. 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.

What is the temperature in May in Columbia Falls?

In May, in Columbia Falls, Montana, the average high-temperature is 59.5°F (15.3°C), and the average low-temperature is 35.2°F (1.8°C).

What is the average humidity in May in Columbia Falls?

In Columbia Falls, Montana, the average relative humidity in May is 68%.

How much does it rain in Columbia Falls in May?

In Columbia Falls, during May, the rain falls for 13.8 days and regularly aggregates up to 1.1" (28mm) of precipitation.

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?

In Columbia Falls, Montana, the average length of the day in May is 15.3h.

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

The average sunshine in May in Columbia Falls, Montana, is 10.4h.

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

In Columbia Falls, Montana, the average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV rays.
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).

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

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

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).

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%).

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").

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).

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

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

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).
Months with the least snowfall days are July and August (0 days).

Average daylight in May / Average sunshine in May - Columbia Falls, MT
  • Average daylight in May: 15.3h

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.4h).

  • Average sunshine in May: 10.4h

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is January (Average sunshine: 3.5h).

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).

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).
Months with the lowest UV index are January, February, November and December (UV index 1).

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).
Months with the least cloud cover are July and August (Cloud cover 15).

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

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