Smithtown experiences a temperate climate with distinct seasons. Winters are chilly, with temperatures ranging from -13°C to 12°C in January and February, averaging around 1°C. Spring brings mild temperatures, gradually warming up to averages of 11°C by April and 16°C by May. Summers are warm, with July and August being the hottest months, averaging around 24°C, while autumn sees a cooling trend, returning to average temperatures around 8°C by November.