Weather in May in Helena, Mt

< May >
	Normal Max/ High Temperature	19°C (65°F)
	Average Temperature	11°C (53°F)
	Min/ Low Temperature	4°C (40°F)
	Normal Precipitation	45mm (1.8in)
	Average Daylight per day	14h 59'
	Sun altitude at solar noon on the 21st day.	63.7°

• The average temperature in Helena, Mt in May is quite mild at 11.4 °C (52.52 °F).
• Afternoons can be somewhat warm with average high temperatures reaching 18.6 °C (65.5 °F).
• Overnight temperatures are generally cool with an average low of 4.2 °C (39.6 °F).
• The range/ variation of diurnal average temperatures in May is 14.4 °C (25.9 °F).
• Precipitation averages for May are moderate with 45.2mm (1.8 in) recorded.
• The shortest day is 14h 21' long and the longest day is 15h 32' long with an average length of 14h 59'.

Weather Trend Graph for May in Helena, Mt, Usa