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Weather in May in Williston, North Dakota

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< May >
 
Normal Max/ High Temperature 20°C (68°F)
 
Average Temperature 13°C (55°F)
 
Min/ Low Temperature 6°C (42°F)
 
Normal Precipitation 51mm (2in)
Number of Wet Days (probability of rain on a day) 9 (29%)
Average Sunlight per day 09:48
Average Daylight per day 15:11
Sunny (Cloudy) Daylight Hours 65% (35%)
Sun altitude at solar noon on the 21st day.
62.1°


  • The average temperature in Williston, North Dakota in May is mild at 12.9 °C (55.22 °F).
  • Afternoons can be warm with average high temperatures reaching 20.2 °C (68.4 °F).
  • Overnight temperatures are generally cool with an average low of 5.7 °C (42.3 °F).
  • The variation/ range of diurnal mean temperatures in May is 14.5 °C (26.1 °F).
  • The weather in May is slightly dry with some rain. Only 50.5mm (2in) of fluid is dumped during an average of 9 days.
  • In May the heavens above Williston, North Dakota are nice and sunny with on balance a substantial, 9:48 of bright sunshine daily.
  • The shortest day is 14:29 long and the longest day is 15:45 long with an average length of 15:11.
  • There are approximately 5:10 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
  • It is sunny approximately 65.5% of daylight hours and cloudy 34.5% of daylight hours.

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Weather Trend Graph for May in Williston, North Dakota, Usa

Graph of weather in Williston, North Dakota in May

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