- Latitude: 34.112
- Longitude: -117.688
High Temperatures
On April 20 in this location the average high temperature is 76.7 °F (24.8 °C). The lowest recored high temperature was 57.9 °F (14.4 °C) in 1971 and the highest recored high temperature was 100.9 °F (38.3 °C) in 2009. The high temperature is usually* between 70.2 °F (21.2 °C) and 83.1 °F (28.4 °C). About a quarter of the time, the high temperature is less than 70.2 °F (21.2 °C), and another quarter of the time, the high temperature is greater than and 83.1 °F (28.4 °C). About 95% of the time, the high temperature has been between 57.9 °F (14.4 °C) and 95.4 °F (35.2 °C).
Low Temperatures
On April 20 in this location the average low temperature is 49.5 °F (9.7 °C). The lowest recored low temperature was 35.1 °F (1.7 °C) in 1979 and the lowest recored low temperature was 68.0 °F (20.0 °C) in 2021. The low temperature is usually* between 45.6 °F (7.5 °C) and 53.4 °F (11.9 °C). About a quarter of the time, the low temperature is less than 45.6 °F (7.5 °C), and another quarter of the time, the low temperature is greater than and 53.4 °F (11.9 °C). About 95% of the time, the low temperature has been between 38.1 °F (3.4 °C) and 60.8 °F (16.0 °C).
Frost
On April 20 in this location expect the temperatures to drop below freezing for a risk of frost about 0.1% 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
- 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
- EL MONTE AIRPORT — Integrated Surface Dataset (ISD) station ID: 747043 — Weather Bureau Army Navy (WBAN): 03165 — 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 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