Weather is only one factor, but it can really affect your travel plans, especially when you are planning a longer stay in Hertel. The hottest months are usually July and August, with an average temperature of 19°C, while the coldest months are January and February, with an average of -7°C. The snowiest months in Hertel are March, April, January and February, with each month seeing an average of 20 cm of snowfall.