Weather is only one factor, but it can really affect your travel plans, especially when you are planning a longer stay in Middleton. The hottest months are usually July and August, with an average temperature of 17°C, while the coldest months are February and January, with an average of -2°C. The snowiest months in Middleton are February, January, December and March, with each month seeing an average of 45 cm of snowfall.