Winter Weather Forecast 2024 2025 Ontario. Noaa is predicting a 71% chance of la niña emerging from september to november 2024, and it's expected to persist through january to march 2025. Environment canada has issued a winter weather travel advisory for a large swath of ontario, including toronto and the gta, as snow is expected to move into the region on.
Expected conditions (temperature and humidity) are too close to predict the type of precipitation. Ontario’s winter weather forecast calls for total chaos in december and a chilly christmas narcity staff.