Weather is only one factor, but it can really affect your travel plans, especially when you're planning an extended stay in Delmont. The hottest months are usually July and August, with an average temperature of 22°C, while the coldest months are January and February, with an average of -3°C. The snowiest months in Delmont are December, January, March and February, with each month seeing an average of 17 cm of snowfall.