May weather forecast
Garrison, MT

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Weather in May

May, the last month of the spring in Garrison, is a moderate month, with an average temperature ranging between max 55.6°F (13.1°C) and min 33.6°F (0.9°C).

Temperature

May shows a rise in the average high-temperature, moving from April's chilly 43.9°F (6.6°C) to a mild 55.6°F (13.1°C). Garrison, after hot May days, encounters a marked drop to an average nighttime temperature of 33.6°F (0.9°C).

Humidity

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

Rainfall

In May, in Garrison, the rain falls for 17 days. Throughout May, 2.4" (61mm) of precipitation is accumulated. In Garrison, during the entire year, the rain falls for 122.8 days and collects up to 17.13" (435mm) of precipitation.

Snowfall

Months with snowfall are January through June, September through December. In May, it is snowing for 7.7 days. Throughout May, 4.96" (126mm) of snow is accumulated. Throughout the year, in Garrison, Montana, there are 125.4 snowfall days, and 77.91" (1979mm) of snow is accumulated.

Daylight

In Garrison, the average length of the day in May is 15h and 2min.
On the first day of the month, sunrise is at 6:15 am and sunset at 8:41 pm. On the last day of May, in Garrison, Montana, sunrise is at 5:41 am and sunset at 9:16 pm MDT.

Sunshine

The average sunshine in May is 10.1h.

UV index

In May, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In May, a regular UV index of 4 translates into these guidelines:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
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Frequently asked questions

What are May temperatures in Garrison?

In Garrison, 55.6°F (13.1°C) is the average high-temperature and 33.6°F (0.9°C) is the average low-temperature during May.

What is the average humidity in May in Garrison?

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

How many days does it rain in May in Garrison?

In Garrison, Montana, in May, during 17 rainfall days, 2.4" (61mm) of precipitation is typically accumulated.

How much does it snow in Garrison in May?

In Garrison, Montana, during May, snow falls for 7.7 days and regularly aggregates up to 4.96" (126mm) of snow.

How many hours of daylight does Garrison have in May?

In May, the average day length in Garrison is 15h and 2min.

When are sunrise and sunset in May in Garrison?

On the first day of May in Garrison, Montana, sunrise is at 6:15 am and sunset at 8:41 pm. On the last day of the month, sunrise is at 5:41 am and sunset at 9:16 pm MDT.

How long on average sun shines in May in Garrison?

The average sunshine duration in May in Garrison is 10.1h.

What is the UV index intensity in May in Garrison?

The average daily maximum UV index in May in Garrison, Montana, is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability 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
Garrison, MT

Average temperature in May - Garrison, MT
  • Average high temperature in May: 55.6°F

The warmest month (with the highest average high temperature) is July (76.8°F).
The month with the lowest average high temperature is December (25.7°F).

  • Average low temperature in May: 33.6°F

The month with the highest average low temperature is August (47.3°F).
The coldest month (with the lowest average low temperature) is December (12.6°F).

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Average pressure in May
Garrison, MT

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

The months with the highest atmospheric pressure are January and December (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in May
Garrison, MT

Average wind speed in May - Garrison, MT
  • Average wind speed in May: 5.5mph

The windiest months (with the highest average wind speed) are January, April and November (6.3mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in May
Garrison, MT

Average humidity in May - Garrison, MT
  • Average humidity in May: 68%

The months with the highest relative humidity are January and February (88%).
The months with the lowest relative humidity are July and August (49%).

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Average rainfall in May
Garrison, MT

Average rainfall in May - Garrison, MT
  • Average rainfall in May: 2.4"

The wettest month (with the highest rainfall) is June (2.52").
The driest month (with the least rainfall) is August (0.67").

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Average rainfall days in May
Garrison, MT

Average rainfall days in May - Garrison, MT
  • Average rainfall days in May: 17 days

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is August (7.3 days).

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Average snowfall in May
Garrison, MT

Average snowfall in May - Garrison, MT
  • Average snowfall in May: 4.96"

The month with the highest snowfall is February (12.76").
The months with the least snowfall are July and August (0").

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Average snowfall days in May
Garrison, MT

Average snowfall days in May - Garrison, MT
  • Average snowfall days in May: 7.7 days

The month with the highest number of snowfall days is February (20.3 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
Garrison, MT

Average daylight in May / Average sunshine in May - Garrison, MT
  • Average daylight in May: 15h and 0min

The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).

  • Average sunshine in May: 10h and 1min

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

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Average sunshine days in May
Garrison, MT

Average sunshine days in May - Garrison, MT
  • Average sunshine days in May: 8.7 days

The month with the most sunshine days is July (21.5 days).
The month with the least sunshine days is April (6.3 days).

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Average UV index in May
Garrison, MT

Average UV index in May - Garrison, MT
  • Average UV index in May: 4

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average cloud cover in May
Garrison, MT

Average cloud cover in May - Garrison, MT
  • Average cloud cover in May: 35

The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 15).

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Average visibility in May
Garrison, MT

Average visibility in May - Garrison, MT
  • Average visibility in May: 6mi

The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March and December (4mi).

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Garrison, Montana, USA

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