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Ontario, CA Weather on April 11
April 11th in Ontario, CA typically brings pleasant spring weather, with average highs around 73°F and lows near 49°F. Over 42 years of records, the warmest April 11th was in 2025 (73°F average), while the coldest was 1975 (48°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 17% of April 11th dates historically, with the wettest April 11th recording 1.52" of rain. The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.
What to Expect on April 11
Planning for April 11th in Ontario, CA? Great weather for outdoor activities.
April 11 Weather Records for Ontario
- •The all-time record high for April 11th in Ontario, CA is 90°F, set in 2008.
- •The coldest April 11th on record dropped to 37°F in 1974.
- •Temperatures have reached 90°F or higher on April 11th in 1 of the last 42 years.
- •Last year (1971), April 11th was 5°F warmer than the long-term average.
Frequently Asked Questions
What was the warmest April 11 ever in Ontario?
The warmest April 11 in Ontario, CA reached 90°F in 2008. That is 17°F above the long-term average high of 73°F.
What was the coldest April 11 ever in Ontario?
The coldest April 11 in Ontario, CA dropped to 37°F in 1974. That is 12°F below the long-term average low of 49°F.
What is the average temperature on April 11 in Ontario?
On April 11, Ontario averages a high of 73°F and a low of 49°F based on 42 years of NOAA weather observations from ONTARIO INTL AP.
How many years of weather data are available for April 11 in Ontario?
We have 42 years of weather records for April 11 in Ontario, CA, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
April 11 Weather History in Ontario
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 89°F | 58°F | 0" | -- |
| 2024 | 88°F | 54°F | 0" | -- |
| 2023 | 79°F | 50°F | 0" | -- |
| 2022 | 66°F | 52°F | 0.08" | -- |
| 2021 | 79°F | 54°F | 0" | -- |
| 2020 | 69°F | 47°F | 0" | -- |
| 2019 | 77°F | 52°F | 0" | -- |
| 2018 | 84°F | 56°F | 0" | -- |
| 2017 | 79°F | 51°F | 0" | -- |
| 2016 | 76°F | 55°F | 0" | -- |
| 2015 | 76°F | 50°F | 0" | -- |
| 2014 | 86°F | 55°F | 0" | -- |
| 2013 | 81°F | 52°F | 0" | -- |
| 2012 | 60°F | 49°F | 0.86" | -- |
| 2011 | 76°F | 49°F | 0" | -- |
| 2010 | 60°F | 50°F | 0.23" | -- |
| 2009 | 62°F | 48°F | 0" | -- |
| 2008 | 90°F | 51°F | 0" | -- |
| 2007 | 72°F | 51°F | 0" | -- |
| 2006 | 69°F | 50°F | 0" | -- |
| 2005 | 79°F | 48°F | 0" | -- |
| 2004 | 87°F | 52°F | 0" | -- |
| 2003 | 73°F | 52°F | 0" | -- |
| 2002 | 81°F | 50°F | 0" | -- |
| 2001 | 55°F | 45°F | 0.05" | -- |
| 2000 | 88°F | 51°F | 0" | -- |
| 1999 | 56°F | 42°F | 1.52" | -- |
| 1998 | 61°F | 45°F | 0.69" | -- |
| 1984 | 79°F | 49°F | 0" | -- |
| 1983 | 59°F | 45°F | 0.28" | -- |
| 1982 | 69°F | 59°F | 0" | -- |
| 1981 | 71°F | 52°F | 0" | -- |
| 1980 | 85°F | 50°F | 0" | -- |
| 1979 | 68°F | 41°F | 0" | -- |
| 1978 | 73°F | 48°F | 0" | -- |
| 1977 | 65°F | 42°F | 0" | -- |
| 1976 | 65°F | 39°F | 0" | -- |
| 1975 | 59°F | 38°F | 0" | -- |
| 1974 | 75°F | 37°F | 0" | -- |
| 1973 | 76°F | 40°F | 0" | -- |
| 1972 | 65°F | 44°F | 0" | -- |
| 1971 | 78°F | 45°F | 0" | -- |
Based on 42 years of data from NOAA station: ONTARIO INTL AP
Monthly Climate Averages
Historical temperature and precipitation averages for Ontario, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.