May Weather forecast - Spring forecast

Weather in May
Frequently asked questions
Average temperature in May
Average pressure in May
Average wind speed in May
Average humidity in May
Average rainfall in May
Average rainfall days in May
Average snowfall in May
Average snowfall days in May
Average daylight in May
Average sunshine in May
Average sunshine days in May
Average UV index in May
Average cloud cover in May
Average visibility in May

Large, scenic rocks and trees around this tiny Sylvan Lake located in the tranquil Custer State Park in Custer City, South Dakota

Weather in May

May, the last month of the spring in Custer, is an enjoyable month, with an average temperature varying between 42.4°F (5.8°C) and 61°F (16.1°C).

Temperature

In Custer, the average high-temperature in May rises from a cool 50.9°F (10.5°C) in April to an enjoyable 61°F (16.1°C). In May, the average low-temperature is 42.4°F (5.8°C).

Humidity

The average relative humidity in May in Custer is 66%.

Rainfall

In Custer, in May, it is raining for 18.6 days, with typically 3.11" (79mm) of accumulated precipitation. In Custer, during the entire year, the rain falls for 135.4 days and collects up to 20.39" (518mm) of precipitation.

Snowfall

Months with snowfall in Custer are January through May, September through December. May is the last month it regularly snows. During 3.4 snowfall days, in May, Custer aggregates 4.09" (104mm) of snow. Throughout the year, there are 75.1 snowfall days, and 40.24" (1022mm) of snow is accumulated.

Daylight

In May, the average length of the day in Custer, South Dakota, is 14h and 45min.
On the first day of the month, sunrise is at 5:46 am and sunset at 7:56 pm. On the last day of May, in Custer, sunrise is at 5:15 am and sunset at 8:28 pm MDT.

Sunshine

In May, the average sunshine is 10.1h.

UV index

The average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 4 in May transform into the following instructions:
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. 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 temperature in May in Custer?

The average high-temperature, in May, in Custer, South Dakota, is 61°F (16.1°C), while the average low-temperature is 42.4°F (5.8°C).

What is the average humidity in May in Custer?

In May, the average relative humidity in Custer is 66%.

How many days does it rain in May in Custer?

In Custer, during May, the rain falls for 18.6 days and regularly aggregates up to 3.11" (79mm) of precipitation.

What is the last month it snows in Custer?

May is the last month it regularly snows in Custer. During 3.4 snowfall days, in May, Custer aggregates 4.09" (104mm) of snow.

How many hours of daylight does Custer have in May?

In Custer, South Dakota, the average day length in May is 14h and 45min.

When is the sunrise / sunset in May in Custer?

In May, on the first day of the month, sunrise is at 5:46 am and sunset at 7:56 pm. On the last day of the month, in Custer, South Dakota, sunrise is at 5:15 am and sunset at 8:28 pm MDT.

How long on average sun shines in May in Custer?

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

What is the UV index reading in May in Custer?

The average daily maximum UV index in May in Custer is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A May J J A S O N D

Apr

May

Jun

Average high temperature

50.9°F 10.5°C

61°F 16.1°C

74.1°F 23.4°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

10.4mph 16.7km/h

9.7mph 15.6km/h

9.2mph 14.8km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

9.8

7.8

7.9

Average UV index

Average cloud cover

Average visibility

Average temperature in May
Custer, SD

Average high temperature in May: 61°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (29.8°F).

Average low temperature in May: 42.4°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is February (16.2°F).

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Average pressure in May
Custer, SD

Average pressure in May: 29.91"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in May
Custer, SD

Average wind speed in May: 8.9mph

The windiest month (with the highest average wind speed) is April (9.5mph).
The calmest month (with the lowest average wind speed) is August (7mph).

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Average humidity in May
Custer, SD

Average humidity in May: 66%

The months with the highest relative humidity are January and February (77%).
The months with the lowest relative humidity are August and September (52%).

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Average rainfall in May
Custer, SD

Average rainfall in May: 3.11"

The wettest month (with the highest rainfall) is June (3.19").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in May
Custer, SD

Average rainfall days in May: 18.6 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is November (4.5 days).

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Average snowfall in May
Custer, SD

Average snowfall in May: 4.09"

The month with the highest snowfall is April (7.24").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in May
Custer, SD

Average snowfall days in May: 3.4 days

The month with the highest number of snowfall days is February (12.9 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
Custer, SD

Average daylight in May: 14h and 45min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 59min).

Average sunshine in May: 10h and 6min

The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 0min).

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Average sunshine days in May
Custer, SD

Average sunshine days in May: 7.8 days

The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is May (7.8 days).

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Average UV index in May
Custer, SD

Average UV index in May: 4

The month with the highest UV index is July (UV index 6).
The 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
Custer, SD

Average cloud cover in May: 35

The month with the most cloud cover is April (Cloud cover 38).
The month with the least cloud cover is August (Cloud cover 17).

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Average visibility in May
Custer, 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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May weather forecast
Custer, SD

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