If you're looking for summer vibes, the best time to travel to Frankfurt is in July, June and August, when the average temperature reaches 23.07 °C, while July, August and April are the 3 sunniest months of the year, with an average of 113.52 hours.
However, if you prefer colder temperatures, make sure you visit Frankfurt during January, February or December to experience an average of 0.81 °C.
For those who don't care too much about temperatures, but want to avoid getting wet in the rain, it's important to avoid travelling during January, February and March, when the average precipitation in Frankfurt is 7.5 mm, while the months of January, February and March are drier, with an average of 0 mm.