 100 F (37.7 °C) readings happen very rarely; On 29 July 2009, during a prolonged period of hot weather, Puyallup recorded a reading of 105 °F (40.5 °C), the warmest since records have been kept.Summer thunderstorms happen occasionally, but are often isolated and rarely (if ever) severe.Storms often roll off the Cascades, and into the surrounding areas.