Weather on April 20
Ontario, CA
55 Years of Data
Avg High
76°F
Avg Low
49°F
Warmest
2009
80°F avg
Coldest
1971
48°F avg
About This Date
April 20th in Ontario, CA typically brings pleasant spring weather, with average highs around 76°F and lows near 49°F — a 27°F daily swing. Over 42 years of records, the warmest April 20th was in 2009 (80°F average), while the coldest was 1971 (48°F) — a 32°F range across recorded history. Rain or other precipitation has occurred on about 10% of April 20th dates historically, with the wettest April 20th recording 2.11" of rain. The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
Planning for April 20th in Ontario, CA? Great weather for outdoor activities.
Warming Trend
1.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 50° | 65° | — | — |
| 2024 | 74° | 53° | 63° | — | — |
| 2023 | 84° | 48° | 66° | — | — |
| 2022 | 70° | 52° | 61° | — | — |
| 2021 | 80° | 53° | 67° | — | — |
| 2020 | 65° | 53° | 59° | — | — |
| 2019 | 71° | 58° | 64° | — | — |
| 2018 | 78° | 46° | 62° | — | — |
| 2017 | 81° | 52° | 66° | — | — |
| 2016 | 90° | 58° | 74° | — | — |
| 2015 | 77° | 54° | 65° | — | — |
| 2014 | 85° | 55° | 70° | — | — |
| 2013 | 92° | 50° | 71° | — | — |
| 2012 | 96° | 56° | 76° | — | — |
| 2011 | 68° | 57° | 63° | — | — |
| 2010 | 70° | 49° | 59° | 0.53" | — |
| 2009warmest | 100° | 61° | 80° | — | — |
| 2008 | 67° | 48° | 57° | — | — |
| 2007 | 53° | 48° | 51° | 2.11" | — |
| 2006 | 83° | 52° | 67° | — | — |
| 2005 | 72° | 47° | 59° | — | — |
| 2004 | 73° | 48° | 61° | — | — |
| 2003 | 78° | 48° | 63° | — | — |
| 2002 | 71° | 40° | 55° | — | — |
| 2001 | 61° | 48° | 54° | 0.53" | — |
| 2000 | 82° | 49° | 65° | — | — |
| 1999 | 80° | 54° | 67° | — | — |
| 1998 | 91° | 46° | 69° | — | — |
| 1984 | 75° | 39° | 57° | — | — |
| 1983 | 61° | 51° | 56° | 0.84" | — |
| 1982 | 80° | 46° | 63° | — | — |
| 1981 | 67° | 47° | 57° | — | — |
| 1980 | 79° | 52° | 65° | — | — |
| 1979 | 80° | 44° | 62° | — | — |
| 1978 | 64° | 47° | 55° | — | — |
| 1977 | 81° | 42° | 61° | — | — |
| 1976 | 85° | 50° | 67° | — | — |
| 1975 | 78° | 40° | 59° | — | — |
| 1974 | 68° | 38° | 53° | — | — |
| 1973 | 68° | 38° | 53° | — | — |
| 1972 | 70° | 35° | 52° | — | — |
| 1971coldest | 54° | 43° | 48° | — | — |
42 years of data from ONTARIO INTL AP