May weather forecast and climate
Sweet Grass, MT

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

Temperature

In Sweet Grass, the average high-temperature rises, from a frosty 49.6°F (9.8°C) in April, to a mild 60.3°F (15.7°C). In Sweet Grass, 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, it is raining for 10.4 days, with typically 1.3" (33mm) of accumulated precipitation. Throughout the year, in Sweet Grass, there are 70.4 rainfall days, and 8.46" (215mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, September through December. May is the last month it regularly snows. During 1.3 snowfall days, Sweet Grass aggregates 0.79" (20mm) of snow. Throughout the year, in Sweet Grass, Montana, there are 54.3 snowfall days, and 19.49" (495mm) of snow is accumulated.

Daylight

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

Sunshine

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

UV index

In May, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 4 transform into the following instructions:
Take precautions - Protection against sunburn is recommended. 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 Sweet Grass?

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

What is the average humidity in May in Sweet Grass?

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

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

In Sweet Grass, in May, it is raining for 10.4 days, with typically 1.3" (33mm) of accumulated precipitation.

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.

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

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?

The average sunshine in May is 10.3h.

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

In May, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to the Sun's UV rays.
Average temperature in May - Sweet Grass, MT
  • Average high temperature in May: 15.7°C

The warmest month (with the highest average high temperature) is July (26°C).
The month with the lowest average high temperature is December (-2.7°C).

  • Average low temperature in May: 5.8°C

The month with the highest average low temperature is August (12.9°C).
The coldest month (with the lowest average low temperature) is December (-9.3°C).

Average pressure in May - Sweet Grass, MT
  • Average pressure in May: 1013.7mbar

The month with the highest atmospheric pressure is January (1020.3mbar).
The month with the lowest atmospheric pressure is June (1011.5mbar).

Average wind speed in May - Sweet Grass, MT
  • Average wind speed in May: 16km/h

The windiest month (with the highest average wind speed) is January (19km/h).
The calmest month (with the lowest average wind speed) is August (14.1km/h).

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%).

Average rainfall in May - Sweet Grass, MT
  • Average rainfall in May: 33mm

The wettest month (with the highest rainfall) is June (45mm).
The driest month (with the least rainfall) is July (8mm).

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).

Average snowfall in May - Sweet Grass, MT
  • Average snowfall in May: 20mm

The month with the highest snowfall is February (91mm).
Months with the least snowfall are June, July and August (0mm).

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).

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).

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).

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).

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).

Average visibility in May - Sweet Grass, MT
  • Average visibility in May: 10km

Months with the highest visibility are May, June, July, August, September and October (10km).
Months with the lowest visibility are January, February, March, April, November and December (9km).