Winters are wet but mild, with most of Perth's annual rainfall between May and September. Winters see significant rainfall as frontal systems move across the region, interspersed with clear and sunny days where minimum temperatures tend to drop below . The lowest temperature recorded in Perth was on 17 June 2006. The lowest temperature within the Perth metropolitan area was on the same day at Jandakot Airport, although temperatures at or below zero are rare occurrences. The lowest maximum temperature recorded in Perth is on 26 June 1956. It occasionally gets cold enough for frost to form. While snow has never been recorded in the Perth CBD, light snowfalls have been reported in outer suburbs of Perth in the Perth Hills around Kalamunda, Roleystone and Mundaring. The most recent snowfall was in 1968.