Williston
North Dakota, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Williston, ND

May, the last month of the spring, in Williston, is a comfortable month, with average temperature ranging between min 40.5°F (4.7°C) and max 67.6°F (19.8°C).

Temperature

In May, the average high-temperature rises, from a mild 57°F (13.9°C) in April, to an enjoyable 67.6°F (19.8°C). In May, in Williston, North Dakota, the average low-temperature is 40.5°F (4.7°C).

Humidity

The average relative humidity in May is 58.5%.

Rainfall

In Williston, during May, the rain falls for 10 days and regularly aggregates up to 1.9" (48.8mm) of precipitation. In Williston, North Dakota, during the entire year, the rain falls for 96.5 days and collects up to 14.4" (364.9mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall.

Daylight

In Williston, the average length of the day in May is 15.2h.

Sunshine

In Williston, the average sunshine in May is 9.6h.

UV index

In May, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation for ordinary individuals.
The daily maximum UV index of 6 interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 Williston?

In May, the average high-temperature is 67.6°F (19.8°C), and the average low-temperature is 40.5°F (4.7°C).

What is the average humidity in May in Williston?

In May, the average relative humidity in Williston is 58.5%.

How much does it rain in Williston in May?

In May, in Williston, North Dakota, the rain falls for 10 days. Throughout May, 1.9" (48.8mm) of precipitation is accumulated.

What is the last month it snows in Williston?

May is the last month it regularly snows in Williston. During 0.8 snowfall days, in May, Williston aggregates 1.3" (33mm) of snow.

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

In May, the average length of the day is 15.2h.

How long on average sun shines in May in Williston?

In May, the average sunshine is 9.6h.

How high is the UV index in May in Williston?

In May, the average daily maximum UV index in Williston, North Dakota, is 6. A UV Index reading of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation.
Average temperature in May - Williston, ND
  • Average high temperature in May: 67.7°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (21.9°F).

  • Average low temperature in May: 40.5°F

The month with the highest average low temperature is July (55.8°F).
The coldest month (with the lowest average low temperature) is January (0.1°F).

Average humidity in May - Williston, ND
  • Average humidity in May: 58.5%

The month with the highest relative humidity is December (77.1%).
The month with the lowest relative humidity is August (54.9%).

Average rainfall in May - Williston, ND
  • Average rainfall in May: 1.9"

Wettest months (with the highest rainfall) are June and July (2.5").
The driest month (with the lowest rainfall) is February (0.4").

Average rainfall days in May - Williston, ND
  • Average rainfall days in May: 10 days

The month with the highest number of rainy days is June (11.5 days).
The month with the lowest number of rainy days is February (6 days).

Average snowfall in May - Williston, ND
  • Average snowfall in May: 1.3"

The month with the highest snowfall is January (10").
Months with the lowest snowfall are June, July and August (0").

Average snowfall days in May - Williston, ND
  • Average snowfall days in May: 0.8 days

The month with the highest number of snowfall days is December (9.1 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

Average daylight in May / Average sunshine in May - Williston, ND
  • Average daylight in May: 15.2h

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

  • Average sunshine in May: 9.6h

The month with most sunshine is July (Average sunshine: 11.8h).
The month with least sunshine is December (Average sunshine: 4h).

Average UV index in May - Williston, ND
  • Average UV index in May: 6

The month with the highest UV index is July (UV index 8).
Months with the lowest UV index are January, February, November and December (UV index 1).