Ontario, California, enjoys a Mediterranean climate characterized by hot, dry summers and mild, wet winters. Understanding these patterns can help residents and visitors make the most of each season.
Spring (March – May)
Spring brings mild to warm days with cool nights and minimal rainfall. Average high temperatures range from 70.7°F in March to 78.3°F in May, while lows increase from 46.9°F to 53.6°F over the same period. This season is ideal for outdoor activities like hiking and picnics.
Summer (June – August)
Summers are hot and dry, with average highs reaching 84.7°F in June and peaking at 93.1°F in August. Low temperatures range from 57.5°F to 63°F. It’s advisable to plan indoor or water-based activities during peak heat and stay hydrated.
Fall (September – November)
Fall offers warm early months transitioning to pleasantly mild conditions. September sees average highs of 90.1°F, cooling to 73.9°F by November. This season is perfect for festivals and outdoor dining.
Winter (December – February)
Winters are cool with occasional rainfall. December and January have average highs around 66.4°F to 67.3°F and lows in the low 40s. February is the wettest month, averaging 1.77 inches of precipitation. While snow is rare in the city, nearby mountains may experience snowfall, offering opportunities for winter sports.
Climate Change Considerations
Climate change is impacting California’s weather patterns, leading to more frequent and extreme events such as severe rain, ice, and windstorms, prolonged heatwaves, and milder winters. These changes can affect water resources, agriculture, and public health. Staying informed and prepared is essential for adapting to these evolving conditions.
By understanding Ontario’s climate and staying aware of environmental changes, residents and visitors can better plan and enjoy all that the city has to offer throughout the year.