Climate patterns play a significant role in shaping the weather we experience each year. One of the most influential of these patterns is La Niña, a climate phenomenon that occurs when sea surface temperatures in the central and eastern Pacific Ocean are cooler than average. According to the National Oceanic and Atmospheric Administration (NOAA), the current forecasts indicate that 2025 will be a La Niña year, meaning Ontario residents may see impacts ranging from colder winters to wetter conditions (NOAA, 2025).
Historically, La Niña winters in Canada are associated with colder-than-average temperatures, particularly in the Prairie Provinces and Ontario (Environment and Climate Change Canada [ECCC], 2024). Southern Ontario often experiences heavier snowfall and prolonged cold spells. La Niña can also increase the frequency of storms, creating greater risks of ice, flooding, and power outages (Government of Canada, 2024).
During the last strong La Niña event in 2020–2021, Ontario experienced heavier snowfalls and icy road conditions that led to widespread transportation delays and higher home heating costs (ECCC, 2021). The pattern can also heighten risks of flooding in low-lying areas due to rapid snowmelt in the spring.
Ontario homeowners can reduce risks and costs by taking proactive measures before the season begins. Preparing for intense and unpredictable weather helps not only to protect property but also to ensure safety and comfort throughout the winter.
La Niña may bring colder and stormier conditions, but with preparation, households can manage the challenges effectively and even take advantage of available rebates and programs to improve home resilience.
