Weather on March 20
Ontario, CA
55 Years of Data
About This Date
March 20th in Ontario, CA typically brings pleasant spring weather, with average highs around 71°F and lows near 48°F. Over 42 years of records, the warmest March 20th was in 2026 (82°F average), while the coldest was 1982 (47°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 24% of March 20th dates historically, with the wettest March 20th recording 2.59" of rain. The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
Planning for March 20th in Ontario, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 100° | 65° | 82° | — | — |
| 2025 | 73° | 50° | 62° | — | — |
| 2024 | 75° | 52° | 63° | — | — |
| 2023 | 61° | 50° | 55° | 0.43" | — |
| 2022 | 70° | 50° | 60° | — | — |
| 2021 | 68° | 51° | 60° | — | — |
| 2020 | 63° | 48° | 55° | 0.05" | — |
| 2019 | 67° | 53° | 60° | 0.13" | — |
| 2018 | 76° | 53° | 64° | — | — |
| 2017 | 71° | 52° | 61° | — | — |
| 2016 | 79° | 50° | 64° | — | — |
| 2015 | 85° | 53° | 69° | — | — |
| 2014 | 80° | 53° | 67° | — | — |
| 2013 | 73° | 52° | 62° | — | — |
| 2012 | 69° | 42° | 56° | — | — |
| 2011 | 56° | 47° | 51° | 0.58" | — |
| 2010 | 84° | 49° | 66° | — | — |
| 2009 | 74° | 50° | 62° | — | — |
| 2008 | 72° | 47° | 59° | — | — |
| 2007 | 63° | 50° | 56° | — | — |
| 2006 | 58° | 44° | 51° | 0.51" | — |
| 2005 | 65° | 48° | 56° | 0.08" | — |
| 2004 | 91° | 50° | 71° | — | — |
| 2003 | 63° | 45° | 54° | — | — |
| 2002 | 84° | 45° | 64° | — | — |
| 2001 | 84° | 57° | 71° | — | — |
| 2000 | 66° | 51° | 59° | — | — |
| 1999 | 60° | 44° | 52° | 0.03" | — |
| 1984 | 90° | 46° | 68° | — | — |
| 1983 | 59° | 41° | 50° | — | — |
| 1982coldest | 63° | 32° | 47° | — | — |
| 1981 | 59° | 46° | 53° | 2.16" | — |
| 1980 | 69° | 43° | 56° | — | — |
| 1979 | 60° | 41° | 51° | 0.2" | — |
| 1978 | 66° | 49° | 57° | — | — |
| 1977 | 68° | 39° | 54° | — | — |
| 1976 | 75° | 41° | 58° | — | — |
| 1975 | 70° | 44° | 57° | — | — |
| 1974 | 58° | 46° | 52° | — | — |
| 1973 | 55° | 41° | 48° | 2.59" | — |
| 1972 | 72° | 46° | 59° | — | — |
| 1971 | 72° | 40° | 56° | — | — |
Ontario, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Ontario, CA Monthly Precipitation
Average rainfall per month, in inches.
Ontario, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Ontario, CA
Ontario, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.