When you're travelling with pets, keeping tabs on the weather can help you make the trip more safe and fun for everyone. The hottest months are usually July and August, with an average temperature of 14°C, while the coldest months are January and February, with an average of -2°C. The snowiest months in Cerny Dul are December, November, January and February, with each month seeing an average of 15 cm of snowfall.