- Latitude: 33.975
- Longitude: -117.636
High Temperatures
On April 21 in this location the average high temperature is 76.8 °F (24.9 °C). The lowest recored high temperature was 60.1 °F (15.6 °C) in 2010 and the highest recored high temperature was 100.9 °F (38.3 °C) in 2009. The high temperature is usually* between 70.3 °F (21.3 °C) and 83.3 °F (28.5 °C). About a quarter of the time, the high temperature is less than 70.3 °F (21.3 °C), and another quarter of the time, the high temperature is greater than and 83.3 °F (28.5 °C). About 95% of the time, the high temperature has been between 57.9 °F (14.4 °C) and 95.7 °F (35.4 °C).
Low Temperatures
On April 21 in this location the average low temperature is 49.9 °F (10.0 °C). The lowest recored low temperature was 35.6 °F (2.0 °C) in 2008 and the lowest recored low temperature was 73.0 °F (22.8 °C) in 1987. The low temperature is usually* between 46.0 °F (7.8 °C) and 53.8 °F (12.1 °C). About a quarter of the time, the low temperature is less than 46.0 °F (7.8 °C), and another quarter of the time, the low temperature is greater than and 53.8 °F (12.1 °C). About 95% of the time, the low temperature has been between 38.6 °F (3.7 °C) and 61.3 °F (16.3 °C).
Frost
On April 21 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
- 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 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