Taking into account the local weather in Chlum u Třeboně can help you maximize your time at the pool during your trip. The hottest months are usually July and August with an average temp of 62°F, while the coldest months are January and February with an average of 33°F. The snowiest months in Chlum u Třeboně are December, January, November, and February, with each month seeing an average of 6 inches of snowfall.