May weather forecast and climate
Grafton, ND

The last month of the spring, May, is a comfortable month in Grafton, North Dakota, with average temperature fluctuating between 47.8°F (8.8°C) and 64.6°F (18.1°C).

Temperature

In Grafton, the average high-temperature significantly increases, from a frosty 48.9°F (9.4°C) in April, to an enjoyable 64.6°F (18.1°C). The average low-temperature, in May, is 47.8°F (8.8°C).

Humidity

The average relative humidity in May is 62%.

Rainfall

In Grafton, during May, the rain falls for 13 days and regularly aggregates up to 2.01" (51mm) of precipitation. Throughout the year, there are 97.8 rainfall days, and 15.83" (402mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. May is the last month it regularly snows in Grafton, North Dakota. During 0.4 snowfall days, Grafton aggregates 0.2" (5mm) of snow. Throughout the year, in Grafton, there are 70.4 snowfall days, and 18.46" (469mm) of snow is accumulated.

Daylight

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

Sunshine

In May, the average sunshine in Grafton is 8.9h.

UV index

In May, the average daily maximum UV index in Grafton is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 5 in May transform into the following instructions:
Take precautions - Protection against sun damage is advised. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in May in Grafton?

The average high-temperature, in May, in Grafton, is 64.6°F (18.1°C), while the average low-temperature is 47.8°F (8.8°C).

What is the average humidity in May in Grafton?

In May, the average relative humidity is 62%.

How many days does it rain in May in Grafton?

In Grafton, North Dakota, during May, the rain falls for 13 days and regularly aggregates up to 2.01" (51mm) of precipitation.

What is the last month it snows in Grafton?

May is the last month it regularly snows in Grafton. During 0.4 snowfall days, in May, Grafton aggregates 0.2" (5mm) of snow.

What is the average length of the day in May in Grafton?

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

How many hours of sunshine does Grafton have in May?

In Grafton, the average sunshine in May is 8.9h.

What is the UV index reading in May in Grafton?

In Grafton, North Dakota, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to the UV radiation.
Average temperature in May - Grafton, ND
  • Average high temperature in May: 18.1°C

The warmest month (with the highest average high temperature) is August (26.9°C).
The month with the lowest average high temperature is January (-9.6°C).

  • Average low temperature in May: 8.8°C

The month with the highest average low temperature is July (15.5°C).
The coldest month (with the lowest average low temperature) is January (-17.3°C).

Average pressure in May - Grafton, ND
  • Average pressure in May: 1013.9mbar

The month with the highest atmospheric pressure is February (1021.5mbar).
The month with the lowest atmospheric pressure is June (1010.9mbar).

Average wind speed in May - Grafton, ND
  • Average wind speed in May: 15.7km/h

The windiest month (with the highest average wind speed) is October (17km/h).
The calmest months (with the lowest average wind speed) are July and August (13.1km/h).

Average humidity in May - Grafton, ND
  • Average humidity in May: 62%

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (59%).

Average rainfall in May - Grafton, ND
  • Average rainfall in May: 51mm

The wettest month (with the highest rainfall) is June (71mm).
The driest months (with the least rainfall) are January and February (14mm).

Average rainfall days in May - Grafton, ND
  • Average rainfall days in May: 13 days

The month with the highest number of rainy days is June (15.9 days).
The month with the least rainy days is February (1.6 days).

Average snowfall in May - Grafton, ND
  • Average snowfall in May: 5mm

The month with the highest snowfall is December (100mm).
Months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in May - Grafton, ND
  • Average snowfall days in May: 0.4 days

The month with the highest number of snowfall days is January (14.7 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in May / Average sunshine in May - Grafton, ND
  • Average daylight in May: 15.3h

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.4h).

  • Average sunshine in May: 8.9h

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is January (Average sunshine: 3.2h).

Average sunshine days in May - Grafton, ND
  • Average sunshine days in May: 15.3 days

The month with the most sunshine days is August (19.8 days).
The month with the least sunshine days is June (11.5 days).

Average UV index in May - Grafton, ND
  • Average UV index in May: 5

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February and November (UV index 1).

Average cloud cover in May - Grafton, ND
  • Average cloud cover in May: 40

The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 24).

Average visibility in May - Grafton, ND
  • Average visibility in May: 10km

Months with the highest visibility are May, July, August and September (10km).
Months with the lowest visibility are January, February, March and December (8km).