If you want to explore when it's less busy, book your stay for November. You could find some fantastic deals on Holdernach hotels with a kitchenette around then. The warmest weather is in August, with temperatures ranging from 48ºF (9ºC) to 68ºF (20ºC). It's generally coolest in January, averaging between 18ºF (-8ºC) and 30ºF (-1ºC).