2026 Compare Cities Climate:
Ontario, CA vs Fullerton, CA

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Highlights
- Fullerton has 11.5% less rainy days than Ontario.
- Fullerton has 1.4% more Sunny Days than Ontario.
- On the BestPlaces comfort index, Fullerton scores 5.7% better than Ontario
 Ontario, CAFullerton, CAUnited States
 Rainfall  Unlock1438
 Snowfall0  Unlock28
 Precipitation  Unlock32106
 Sunny279  Unlock205
 Avg. July High  Unlock8586
 Avg. Jan. Low43  Unlock22
 Comfort Index (higher=better)  Unlock9.37
 UV Index5.7  Unlock4.3
 Elevation  Unlock1642443
Reviews for Ontario    6 Reviews

We've lived in this area for several years. Traveling long distances to other cities for churches. Passing a quiet, unassuming church along the way for years. Until  More

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cool  More

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I think Ontario,ca us awesome because we have an entertainment Venue and large shopping mall to please everyone of all  More

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Reviews for Fullerton    13 Reviews

Over 5 years ago

ive lived in this city for a very long time, and it is a great and quiet place to live, with some nice shopping areas and great  More

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David · 

I have been living and working in Fullerton for almost 20 years now and have seen it change through the years, both for the better and worse. Fullerton is a half  More

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Over 10 years ago

The weather here is gorgeous! Warm and rarely rains.  More

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