Weather on May 20
Fullerton, CA
55 Years of Data
Avg High
76°F
Avg Low
57°F
Warmest
2017
80°F avg
Coldest
1972
56°F avg
About This Date
May 20th in Fullerton, CA typically brings pleasant spring weather, with average highs around 76°F and lows near 57°F. Over 55 years of records, the warmest May 20th was in 2017 (80°F average), while the coldest was 1972 (56°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 5% of May 20th dates historically, with the wettest May 20th recording 0.51" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for May 20th in Fullerton, CA? Great weather for outdoor activities.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 88° | 59° | 73° | — | — |
| 2024 | 69° | 59° | 64° | — | — |
| 2023 | 77° | 63° | 70° | — | — |
| 2022 | 71° | 59° | 65° | — | — |
| 2021 | 75° | 61° | 68° | — | — |
| 2020 | 76° | 56° | 66° | — | — |
| 2019 | 77° | 56° | 66° | 0.25" | — |
| 2018 | 69° | 61° | 65° | — | — |
| 2017warmest | 98° | 63° | 80° | — | — |
| 2016 | 76° | 60° | 68° | — | — |
| 2015 | 73° | 58° | 65° | — | — |
| 2014 | 73° | 60° | 67° | — | — |
| 2013 | 82° | 61° | 71° | — | — |
| 2012 | 86° | 59° | 73° | — | — |
| 2011 | 74° | 54° | 64° | — | — |
| 2010 | 79° | 56° | 67° | — | — |
| 2009 | 86° | 60° | 73° | — | — |
| 2008 | 89° | 63° | 76° | — | — |
| 2007 | 73° | 60° | 67° | — | — |
| 2006 | 79° | 63° | 71° | — | — |
| 2005 | 87° | 53° | 70° | — | — |
| 2004 | 75° | 61° | 68° | — | — |
| 2003 | 87° | 57° | 72° | — | — |
| 2002 | 68° | 57° | 63° | 0.51" | — |
| 2001 | 75° | 60° | 68° | — | — |
| 2000 | 86° | 57° | 72° | — | — |
| 1999 | 72° | 57° | 64° | — | — |
| 1998 | 74° | 52° | 63° | — | — |
| 1997 | 75° | 63° | 69° | — | — |
| 1996 | 75° | 59° | 67° | — | — |
| 1995 | 70° | 56° | 63° | — | — |
| 1994 | 74° | 49° | 61° | — | — |
| 1993 | 78° | 63° | 70° | — | — |
| 1992 | 76° | 60° | 68° | — | — |
| 1991 | 72° | 50° | 61° | — | — |
| 1990 | 71° | 52° | 61° | — | — |
| 1989 | 80° | 56° | 68° | — | — |
| 1988 | 85° | 61° | 73° | — | — |
| 1987 | 66° | 59° | 63° | — | — |
| 1986 | 74° | 59° | 66° | — | — |
| 1985 | 72° | 59° | 65° | — | — |
| 1984 | 78° | 57° | 68° | — | — |
| 1983 | 86° | 63° | 74° | — | — |
| 1982 | 77° | 50° | 64° | — | — |
| 1981 | 70° | 49° | 59° | — | — |
| 1980 | 67° | 58° | 62° | — | — |
| 1979 | 69° | 55° | 62° | — | — |
| 1978 | 84° | 53° | 69° | — | — |
| 1977 | 81° | 49° | 65° | — | — |
| 1976 | 75° | 52° | 63° | — | — |
| 1975 | 62° | 50° | 56° | 0.13" | — |
| 1974 | 77° | 41° | 59° | — | — |
| 1973 | 67° | 54° | 60° | — | — |
| 1972coldest | 69° | 42° | 56° | — | — |
| 1971 | 79° | 46° | 62° | — | — |
55 years of data from ANAHEIM