May weather forecast
Belle Fourche, SD

Weather in May

The last month of the spring, May, is an enjoyable month in Belle Fourche, South Dakota, with an average temperature fluctuating between 63.5°F (17.5°C) and 44.6°F (7°C).

Temperature

In May, the average high-temperature increases from a fresh 52.9°F (11.6°C) in April to an enjoyable 63.5°F (17.5°C). In Belle Fourche, in May, the average low-temperature is 44.6°F (7°C).

Humidity

The average relative humidity in May is 63%.

Rainfall

The month with the most rainfall is May, when the rain falls for 14.3 days and typically aggregates up to 2.05" (52mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Belle Fourche. May is the last month it regularly snows in Belle Fourche, South Dakota. During 1.7 snowfall days, in May, Belle Fourche aggregates 1.77" (45mm) of snow. Throughout the year, in Belle Fourche, there are 52.1 snowfall days, and 23.54" (598mm) of snow is accumulated.

Daylight

In May, the average length of the day is 14h and 50min.
On the first day of May in Belle Fourche, sunrise is at 5:44 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 5:13 am and sunset at 8:32 pm MDT.

Sunshine

In Belle Fourche, the average sunshine in May is 10.1h.

UV index

In Belle Fourche, the average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The average daily UV index of 5 in May transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
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FAQ

What is the average humidity in May in Belle Fourche?

The average relative humidity in May in Belle Fourche, South Dakota, is 63%.

What is the rainiest month in Belle Fourche?

May is the month with the most rainfall in Belle Fourche. Rain falls for 14.3 days and accumulates 2.05" (52mm) of precipitation.

How much does it rain in Belle Fourche in May?

In Belle Fourche, during May, the rain falls for 14.3 days and regularly aggregates up to 2.05" (52mm) of precipitation.

What is the last month it snows in Belle Fourche?

May is the last month it regularly snows. During 1.7 snowfall days, in May, Belle Fourche aggregates 1.77" (45mm) of snow.

How many hours of daylight does Belle Fourche have in May?

In May, the average day length in Belle Fourche is 14h and 50min.

When is the sunrise / sunset in May in Belle Fourche?

In May, on the first day of the month, sunrise is at 5:44 am and sunset at 8:00 pm. On the last day of the month, in Belle Fourche, sunrise is at 5:13 am and sunset at 8:32 pm MDT.

How many hours of sunshine does Belle Fourche have in May?

In May, the average sunshine duration in Belle Fourche, South Dakota, is 10.1h.

What is the UV index intensity in May in Belle Fourche?

In Belle Fourche, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Belle Fourche, SD

Average temperature in May - Belle Fourche, SD
  • Average high temperature in May: 63.5°F

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is December (30.4°F).

  • Average low temperature in May: 44.6°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is February (17.1°F).

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Average pressure in May
Belle Fourche, SD

Average pressure in May - Belle Fourche, SD
  • Average pressure in May: 29.91"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in May
Belle Fourche, SD

Average wind speed in May - Belle Fourche, SD
  • Average wind speed in May: 9.7mph

The windiest months (with the highest average wind speed) are January and October (10.4mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).

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Average humidity in May
Belle Fourche, SD

Average humidity in May - Belle Fourche, SD
  • Average humidity in May: 63%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is August (47%).

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Average rainfall in May
Belle Fourche, SD

Average rainfall in May - Belle Fourche, SD
  • Average rainfall in May: 2.05"

The wettest month (with the highest rainfall) is May (2.05").
The driest month (with the least rainfall) is January (0.43").

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Average rainfall days in May
Belle Fourche, SD

Average rainfall days in May - Belle Fourche, SD
  • Average rainfall days in May: 14.3 days

The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is January (2.8 days).

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Average snowfall in May
Belle Fourche, SD

Average snowfall in May - Belle Fourche, SD
  • Average snowfall in May: 1.77"

The month with the highest snowfall is April (4.88").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in May
Belle Fourche, SD

Average snowfall days in May - Belle Fourche, SD
  • Average snowfall days in May: 1.7 days

The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in May /
Average sunshine in May
Belle Fourche, SD

Average daylight in May / Average sunshine in May - Belle Fourche, SD
  • Average daylight in May: 14h and 50min

The month with the longest days is June (Average daylight: 15h and 31min).
The month with the shortest days is December (Average daylight: 8h and 53min).

  • Average sunshine in May: 10h and 6min

The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).

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Average sunshine days in May
Belle Fourche, SD

Average sunshine days in May - Belle Fourche, SD
  • Average sunshine days in May: 12.8 days

The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is April (12.6 days).

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Average UV index in May
Belle Fourche, SD

Average UV index in May - Belle Fourche, SD
  • Average UV index in May: 5

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in May
Belle Fourche, SD

Average cloud cover in May - Belle Fourche, SD
  • Average cloud cover in May: 33

The month with the most cloud cover is February (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 15).

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Average visibility in May
Belle Fourche, SD

Average visibility in May - Belle Fourche, SD
  • Average visibility in May: 6mi

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

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