The average coldest night should fall to −5.6 °C (21.9 °F).[8] On average 35.8 nights[9] will report an air frost, some 119 days[10] of the year will register at least 1mm of precipitation, and on 7.4 days[11] a cover of snow will be observed. All annual averages refer to the observation period 1971–2000.