Weather on March 17
Ontario, CA
55 Years of Data
Avg High
72°F
Avg Low
47°F
Warmest
2026
80°F avg
Coldest
1977
46°F avg
About This Date
March 17th in Ontario, CA typically brings pleasant spring weather, with average highs around 72°F and lows near 47°F — a 25°F daily swing. Over 42 years of records, the warmest March 17th was in 2026 (80°F average), while the coldest was 1977 (46°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 24% of March 17th dates historically, with the wettest March 17th recording 6.17" of rain. The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
Planning for March 17th in Ontario, CA? Great weather for outdoor activities.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 98° | 63° | 80° | — | — |
| 2025 | 66° | 48° | 57° | 0.08" | — |
| 2024 | 71° | 45° | 58° | — | — |
| 2023 | 69° | 44° | 57° | — | — |
| 2022 | 82° | 50° | 66° | — | — |
| 2021 | 69° | 40° | 54° | — | — |
| 2020 | 60° | 46° | 53° | — | — |
| 2019 | 87° | 51° | 69° | — | — |
| 2018 | 60° | 45° | 52° | 0.18" | — |
| 2017 | 86° | 55° | 71° | — | — |
| 2016 | 83° | 54° | 68° | — | — |
| 2015 | 84° | 57° | 71° | — | — |
| 2014 | 78° | 54° | 66° | — | — |
| 2013 | 74° | 50° | 62° | — | — |
| 2012 | 53° | 39° | 46° | 2.62" | — |
| 2011 | 71° | 52° | 61° | — | — |
| 2010 | 83° | 49° | 66° | — | — |
| 2009 | 82° | 50° | 66° | — | — |
| 2008 | 69° | 41° | 55° | — | — |
| 2007 | 83° | 48° | 65° | — | — |
| 2006 | 56° | 44° | 50° | 0.53" | — |
| 2005 | 68° | 48° | 58° | — | — |
| 2004 | 92° | 52° | 72° | — | — |
| 2003 | 65° | 47° | 56° | 0.51" | — |
| 2002 | 57° | 36° | 46° | 1.8" | — |
| 2001 | 73° | 46° | 60° | — | — |
| 2000 | 77° | 54° | 65° | — | — |
| 1999 | 61° | 41° | 51° | — | — |
| 1984 | 73° | 42° | 58° | — | — |
| 1983 | 61° | 48° | 54° | 0.99" | — |
| 1982 | 52° | 43° | 47° | 6.17" | — |
| 1981 | 70° | 44° | 57° | — | — |
| 1980 | 75° | 42° | 59° | — | — |
| 1979 | 60° | 39° | 50° | 2.03" | — |
| 1978 | 87° | 48° | 68° | — | — |
| 1977coldest | 57° | 35° | 46° | 0.64" | — |
| 1976 | 81° | 52° | 66° | — | — |
| 1975 | 64° | 34° | 49° | — | — |
| 1974 | 79° | 52° | 65° | — | — |
| 1973 | 66° | 43° | 54° | — | — |
| 1972 | 76° | 44° | 60° | — | — |
| 1971 | 72° | 45° | 58° | — | — |
42 years of data from ONTARIO INTL AP