- Latitude: 33.975
- Longitude: -117.636
High Temperatures
On June 12 in this location the average high temperature is 83.5 °F (28.6 °C). The lowest recored high temperature was 64.4 °F (18.0 °C) in 2023 and the highest recored high temperature was 109.0 °F (42.8 °C) in 2019. The high temperature is usually* between 78.1 °F (25.6 °C) and 88.8 °F (31.5 °C). About a quarter of the time, the high temperature is less than 78.1 °F (25.6 °C), and another quarter of the time, the high temperature is greater than and 88.8 °F (31.5 °C). About 95% of the time, the high temperature has been between 68.0 °F (20.0 °C) and 98.9 °F (37.2 °C).
Low Temperatures
On June 12 in this location the average low temperature is 57.8 °F (14.3 °C). The lowest recored low temperature was 46.0 °F (7.8 °C) in 2021 and the lowest recored low temperature was 69.8 °F (21.0 °C) in 2014. The low temperature is usually* between 55.3 °F (12.9 °C) and 60.3 °F (15.7 °C). About a quarter of the time, the low temperature is less than 55.3 °F (12.9 °C), and another quarter of the time, the low temperature is greater than and 60.3 °F (15.7 °C). About 95% of the time, the low temperature has been between 50.5 °F (10.3 °C) and 65.1 °F (18.4 °C).
Frost
On June 12 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 2017
- RIVERSIDE MUNI — Integrated Surface Dataset (ISD) station ID: 722869 — from year 1999 to 2005
- CHINO — Integrated Surface Dataset (ISD) station ID: 722899 — from year 1998 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