 Per the Trewartha climate classification system, Beulah clearly falls into class D ("Dcb" or "Dcbo") as only five months of the year have a mean temperature above 10 °C and like Köppen is too wet to be classified as semi-arid or steppe (Köppen "BSk") found over the vast majority of eastern Colorado and the High Plains.Summers are mild with cool nights; daily minimum temperatures at or above 60 °F occur on only about six days per year.High temperatures of 90 °F or higher occur on about 33 days.