May weather forecast and climate
Sweet Grass, MT

Weather in May

May, the last month of the spring, in Sweet Grass, is a moderate month, with average temperature fluctuating between 42.4°F (5.8°C) and 60.3°F (15.7°C).

Temperature

In Sweet Grass, the average high-temperature increases, from a frosty 49.6°F (9.8°C) in April, to a mild 60.3°F (15.7°C). In May, the average low-temperature is 42.4°F (5.8°C).

Humidity

In Sweet Grass, the average relative humidity in May is 56%.

Rainfall

In Sweet Grass, during 10.4 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. In Sweet Grass, during the entire year, the rain falls for 70.4 days and collects up to 8.46" (215mm) of precipitation.

Snowfall

Months with snowfall in Sweet Grass are January through May, September through December. May is the last month it regularly snows in Sweet Grass. During 1.3 snowfall days, in May, Sweet Grass aggregates 0.79" (20mm) of snow. In Sweet Grass, during the entire year, snow falls for 54.3 days, and aggregates up to 19.49" (495mm) of snow.

Daylight

In Sweet Grass, the average length of the day in May is 15.3h.

Sunshine

The average sunshine in Sweet Grass is 10.3h.

UV index

In May, the average daily maximum UV index in Sweet Grass, Montana, is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sun damage is advised. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in May in Sweet Grass?

The average high-temperature, in May, in Sweet Grass, is 60.3°F (15.7°C), while the average low-temperature is 42.4°F (5.8°C).

What is the average humidity in May in Sweet Grass?

In May, the average relative humidity in Sweet Grass, Montana, is 56%.

How many days does it rain in May in Sweet Grass?

In May, in Sweet Grass, the rain falls for 10.4 days. Throughout May, 1.3" (33mm) of precipitation is accumulated.

What is the last month it snows in Sweet Grass?

May is the last month it regularly snows in Sweet Grass, Montana. During 1.3 snowfall days, in May, Sweet Grass aggregates 0.79" (20mm) of snow.

What is the average length of the day in May in Sweet Grass?

The average length of the day in May in Sweet Grass is 15.3h.

How many hours of sunshine does Sweet Grass have in May?

In Sweet Grass, the average sunshine in May is 10.3h.

What is the UV index intensity in May in Sweet Grass?

In Sweet Grass, Montana, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in May
Sweet Grass, MT

Average temperature in May - Sweet Grass, MT
  • Average high temperature in May: 60.3°F

The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is December (27.1°F).

  • Average low temperature in May: 42.4°F

The month with the highest average low temperature is August (55.2°F).
The coldest month (with the lowest average low temperature) is December (15.3°F).

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Average pressure in May
Sweet Grass, MT

Average pressure in May - Sweet Grass, MT
  • Average pressure in May: 29.93"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is June (29.87").

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Average wind speed in May
Sweet Grass, MT

Average wind speed in May - Sweet Grass, MT
  • Average wind speed in May: 9.9mph

The windiest month (with the highest average wind speed) is January (11.8mph).
The calmest months (with the lowest average wind speed) are July and August (8.8mph).

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Average humidity in May
Sweet Grass, MT

Average humidity in May - Sweet Grass, MT
  • Average humidity in May: 56%

The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (43%).

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Average rainfall in May
Sweet Grass, MT

Average rainfall in May - Sweet Grass, MT
  • Average rainfall in May: 1.3"

The wettest month (with the highest rainfall) is June (1.77").
The driest month (with the least rainfall) is July (0.31").

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Average rainfall days in May
Sweet Grass, MT

Average rainfall days in May - Sweet Grass, MT
  • Average rainfall days in May: 10.4 days

The month with the highest number of rainy days is May (10.4 days).
The month with the least rainy days is November (2.6 days).

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Average snowfall in May
Sweet Grass, MT

Average snowfall in May - Sweet Grass, MT
  • Average snowfall in May: 0.79"

The month with the highest snowfall is February (3.58").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in May
Sweet Grass, MT

Average snowfall days in May - Sweet Grass, MT
  • Average snowfall days in May: 1.3 days

The month with the highest number of snowfall days is December (10.2 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight in May /
Average sunshine in May
Sweet Grass, MT

Average daylight in May / Average sunshine in May - Sweet Grass, MT
  • Average daylight in May: 15.3h

The month with the longest days is June (Average daylight: 16.1h).
The month with the shortest days is December (Average daylight: 8.3h).

  • Average sunshine in May: 10.3h

The month with the most sunshine is July (Average sunshine: 12h).
Months with the least sunshine are January and December (Average sunshine: 5.6).

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Average sunshine days in May
Sweet Grass, MT

Average sunshine days in May - Sweet Grass, MT
  • Average sunshine days in May: 17.8 days

The month with the most sunshine days is July (23.5 days).
The month with the least sunshine days is April (17.4 days).

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Average UV index in May
Sweet Grass, MT

Average UV index in May - Sweet Grass, 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, March, October, November and December (UV index 2).

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Average cloud cover in May
Sweet Grass, MT

Average cloud cover in May - Sweet Grass, MT
  • Average cloud cover in May: 33

The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 15).

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Average visibility in May
Sweet Grass, MT

Average visibility in May - Sweet Grass, MT
  • Average visibility in May: 6mi

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

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