If you're after the warmest weather, go in July. The temperatures are around 54ºF (12ºC) to 73ºF (23ºC) then. January sees the coolest temperatures between 27ºF (-3ºC) and 36ºF (2ºC). For a more relaxed vibe and potentially cheaper hotels with parking in Rotenburg an der Fulda, visit in November when it's not as busy.