Toronto has a humid continental climate with warm, humid summers and cold winters. The city experiences four distinct seasons, with considerable variance in day to day temperature, particularly during the colder winter season. Owing to urbanization and its proximity to water, Toronto has a fairly low diurnal temperature range (day-night temperature difference).
The denser urban scape makes for warmer nights year-round and is not as cold throughout the winter than surrounding areas (particularly north of the city). However, it can be noticeably cooler on many spring and early summer afternoons under the influence of a lake breeze. Other low-scale maritime effects on the climate include lake-effect snow, fog and delaying of spring- and fall-like conditions, known as seasonal lag.