May weather forecast
Grassy Butte, ND

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Weather in May

The last month of the spring, May, is a refreshing month in Grassy Butte, North Dakota, with an average temperature varying between 46°F (7.8°C) and 64.6°F (18.1°C).

Temperature

With the onset of May, Grassy Butte experiences a temperature shift, with the average high-temperature moving from a fresh 51.3°F (10.7°C) in April to an enjoyable 64.6°F (18.1°C). In May, the average low-temperature is a chilly 46°F (7.8°C).

Humidity

In Grassy Butte, the average relative humidity in May is 58%.

Rainfall

In Grassy Butte, during May, the rain falls for 11.8 days and regularly aggregates up to 1.73" (44mm) of precipitation. In Grassy Butte, North Dakota, during the entire year, the rain falls for 91.6 days and collects up to 12.64" (321mm) of precipitation.

Snowfall

Months with snowfall in Grassy Butte are January through May, October through December. May is the last month it regularly snows in Grassy Butte. During 0.7 snowfall days, in May, Grassy Butte aggregates 0.16" (4mm) of snow. In Grassy Butte, during the entire year, snow falls for 58.2 days and aggregates up to 16.54" (420mm) of snow.

Daylight

In Grassy Butte, the average length of the day in May is 15h and 8min.
On the first day of May in Grassy Butte, sunrise is at 5:34 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 5:00 am and sunset at 8:41 pm MDT.

Sunshine

In Grassy Butte, the average sunshine in May is 9.9h.

UV index

In May, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In May, the maximum UV index of 4 translates into these guidelines:
Guard yourself - Avoiding sunburn is suggested. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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Frequently asked questions

What are May temperatures in Grassy Butte?

In May, in Grassy Butte, the average high-temperature is 64.6°F (18.1°C), and the average low-temperature is 46°F (7.8°C).

What is the average humidity in May in Grassy Butte?

In May, the average relative humidity in Grassy Butte is 58%.

How much does it rain in Grassy Butte in May?

In Grassy Butte, during May, the rain falls for 11.8 days and regularly aggregates up to 1.73" (44mm) of precipitation.

What is the last month it snows in Grassy Butte?

May is the last month it regularly snows in Grassy Butte, North Dakota. During 0.7 snowfall days, in May, Grassy Butte aggregates 0.16" (4mm) of snow.

What is the average length of the day in May in Grassy Butte?

The average day length in May is 15h and 8min.

What time are sunrise and sunset in May in Grassy Butte?

In May, on the first day of the month, sunrise is at 5:34 am and sunset at 8:05 pm. On the last day of the month, in Grassy Butte, sunrise is at 5:00 am and sunset at 8:41 pm MDT.

How long on average sun shines in May in Grassy Butte?

In May, the average sunshine duration in Grassy Butte is 9.9h.

How high is the UV index in May in Grassy Butte?

The average daily maximum UV index in May in Grassy Butte is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe 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
Grassy Butte, ND

Average temperature in May - Grassy Butte, ND
  • Average high temperature in May: 64.6°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (21.4°F).

  • Average low temperature in May: 46°F

The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (7.3°F).

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Average pressure in May
Grassy Butte, ND

Average pressure in May - Grassy Butte, ND
  • Average pressure in May: 29.92"Hg

The month with the highest atmospheric pressure is February (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in May
Grassy Butte, ND

Average wind speed in May - Grassy Butte, ND
  • Average wind speed in May: 10.3mph

The windiest month (with the highest average wind speed) is April (11mph).
The calmest month (with the lowest average wind speed) is August (8.9mph).

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Average humidity in May
Grassy Butte, ND

Average humidity in May - Grassy Butte, ND
  • Average humidity in May: 58%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (49%).

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Average rainfall in May
Grassy Butte, ND

Average rainfall in May - Grassy Butte, ND
  • Average rainfall in May: 1.73"

The wettest month (with the highest rainfall) is June (1.85").
The driest months (with the least rainfall) are January and February (0.43").

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Average rainfall days in May
Grassy Butte, ND

Average rainfall days in May - Grassy Butte, ND
  • Average rainfall days in May: 11.8 days

The month with the highest number of rainy days is June (12.6 days).
The month with the least rainy days is February (2.9 days).

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Average snowfall in May
Grassy Butte, ND

Average snowfall in May - Grassy Butte, ND
  • Average snowfall in May: 0.16"

The month with the highest snowfall is December (3.07").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Grassy Butte, ND

Average snowfall days in May - Grassy Butte, ND
  • Average snowfall days in May: 0.7 days

The months with the highest number of snowfall days are January and December (11.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in May /
Average sunshine in May
Grassy Butte, ND

Average daylight in May / Average sunshine in May - Grassy Butte, ND
  • Average daylight in May: 15h and 1min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in May: 9h and 5min

The month with the most sunshine is July (Average sunshine: 11h and 36min).
The months with the least sunshine are January and December (Average sunshine: 4h and 0min).

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Average sunshine days in May
Grassy Butte, ND

Average sunshine days in May - Grassy Butte, ND
  • Average sunshine days in May: 17.1 days

The month with the most sunshine days is September (20.5 days).
The month with the least sunshine days is April (14.9 days).

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Average UV index in May
Grassy Butte, ND

Average UV index in May - Grassy Butte, ND
  • Average UV index in May: 4

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are February and December (UV index 1).

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Average cloud cover in May
Grassy Butte, ND

Average cloud cover in May - Grassy Butte, ND
  • Average cloud cover in May: 35

The month with the most cloud cover is February (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 19).

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Average visibility in May
Grassy Butte, ND

Average visibility in May - Grassy Butte, ND
  • Average visibility in May: 6mi

The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).

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Grassy Butte, North Dakota, USA

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