Adelaide has a warm Mediterranean climate (Köppen climate classification Csa), where most of the rain falls in the winter months. Despite a warm Mediterranean climate, Adelaide receives enough annual precipitation to avoid Köppen's BSh (semi-arid climate) classification. Rainfall is unreliable, light and infrequent throughout summer. In contrast, the winter has fairly reliable rainfall with June being the wettest month of the year, averaging around 80 mm. Frosts are occasional, with the most notable occurrences having occurred in July 1908 and July 1982. Hail is also common in winter. Snowfall in the metropolitan area is uncommon, except for very light falls at Mount Lofty and some places in the Adelaide Hills, with the most recent occurrence being in October 2012
