- Latitude: 33.975
- Longitude: -117.636
High Temperatures
On May 1 in this location the average high temperature is 78.1 °F (25.6 °C). The lowest recored high temperature was 59.0 °F (15.0 °C) in 2018 and the highest recored high temperature was 98.1 °F (36.7 °C) in 2014. The high temperature is usually* between 72.0 °F (22.2 °C) and 84.2 °F (29.0 °C). About a quarter of the time, the high temperature is less than 72.0 °F (22.2 °C), and another quarter of the time, the high temperature is greater than and 84.2 °F (29.0 °C). About 95% of the time, the high temperature has been between 60.4 °F (15.8 °C) and 95.7 °F (35.4 °C).
Low Temperatures
On May 1 in this location the average low temperature is 52.2 °F (11.2 °C). The lowest recored low temperature was 34.0 °F (1.1 °C) in 1970 and the lowest recored low temperature was 80.6 °F (27.0 °C) in 2014. The low temperature is usually* between 48.7 °F (9.3 °C) and 55.7 °F (13.2 °C). About a quarter of the time, the low temperature is less than 48.7 °F (9.3 °C), and another quarter of the time, the low temperature is greater than and 55.7 °F (13.2 °C). About 95% of the time, the low temperature has been between 42.0 °F (5.5 °C) and 62.4 °F (16.9 °C).
Frost
On May 1 in this location expect the temperatures to drop below freezing for a risk of frost about 0.0% of the time.
Data Source(s)
The data used to compute the average high/low temperatures for this location were taken from the following stations:
- ONTARIO INTERNATIONAL ARPT — Integrated Surface Dataset (ISD) station ID: 747040 — Weather Bureau Army Navy (WBAN): 03102 — from year 2005 to 2025
- RIVERSIDE MUNICIPAL ARPT — Integrated Surface Dataset (ISD) station ID: 722869 — Weather Bureau Army Navy (WBAN): 03171 — from year 2006 to 2025
- CHINO AIRPORT — Integrated Surface Dataset (ISD) station ID: 722899 — Weather Bureau Army Navy (WBAN): 03179 — from year 2006 to 2025
- FULLERTON MUNICIPAL ARPT — Integrated Surface Dataset (ISD) station ID: 722976 — Weather Bureau Army Navy (WBAN): 03166 — from year 2006 to 2025
- CORONA MUNICIPAL AIRPORT — Integrated Surface Dataset (ISD) station ID: 720333 — Weather Bureau Army Navy (WBAN): 53175 — from year 2011 to 2025
- BRACKETT FIELD AIRPORT — Integrated Surface Dataset (ISD) station ID: 722887 — Weather Bureau Army Navy (WBAN): 03180 — from year 2013 to 2025
- CABLE — Integrated Surface Dataset (ISD) station ID: 720329 — from year 2018 to 2025
- CORONA MUNI — Integrated Surface Dataset (ISD) station ID: 720333 — from year 2007 to 2016
- RIVERSIDE MUNI — Integrated Surface Dataset (ISD) station ID: 722869 — from year 1999 to 2005
- CHINO — Integrated Surface Dataset (ISD) station ID: 722899 — from year 1999 to 2005
- ONTARIO INTL ARPT — Integrated Surface Dataset (ISD) station ID: 747040 — from year 2002 to 2004
- ONTARIO — Integrated Surface Dataset (ISD) station ID: 722865 — from year 2000 to 2000
- ONTARIO — Integrated Surface Dataset (ISD) station ID: 722865 — Weather Bureau Army Navy (WBAN): 93180 — from year 1943 to 1999
- ONTARIO INTERNATIONAL ARPT — Weather Bureau Army Navy (WBAN): 03102 — from year 1968 to 1972