Travel1000Places.com
Juli/August: high's up to around 30C / 86 F. Average temperature is just the half of it!
Winter: around freezing point
In general year-round, however, most tourists prefer the time between Spring and Fall.
Leipzig is situated in the continentally influenced interior lowlands; annual mean temperature: 9°C (0°C in January, 18°C in July); annual precipitation: 500–600mm