- Latitude: 33.952
- Longitude: -117.439
High Temperatures
On January 1 in this location the average high temperature is 64.6 °F (18.1 °C). The lowest recored high temperature was 46.0 °F (7.8 °C) in 1960 and the highest recored high temperature was 87.1 °F (30.6 °C) in 2012. The high temperature is usually* between 59.1 °F (15.1 °C) and 70.0 °F (21.1 °C). About a quarter of the time, the high temperature is less than 59.1 °F (15.1 °C), and another quarter of the time, the high temperature is greater than and 70.0 °F (21.1 °C). About 95% of the time, the high temperature has been between 48.8 °F (9.3 °C) and 80.3 °F (26.9 °C).
Low Temperatures
On January 1 in this location the average low temperature is 39.6 °F (4.2 °C). The lowest recored low temperature was 20.1 °F (-6.6 °C) in 2015 and the lowest recored low temperature was 63.0 °F (17.2 °C) in 1936. The low temperature is usually* between 35.4 °F (1.9 °C) and 43.9 °F (6.6 °C). About a quarter of the time, the low temperature is less than 35.4 °F (1.9 °C), and another quarter of the time, the low temperature is greater than and 43.9 °F (6.6 °C). About 95% of the time, the low temperature has been between 27.2 °F (-2.6 °C) and 52.0 °F (11.1 °C).
Frost
On January 1 in this location expect the temperatures to drop below freezing for a risk of frost about 11.4% 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:
- MARCH AIR RESERVE BASE — Integrated Surface Dataset (ISD) station ID: 722860 — Weather Bureau Army Navy (WBAN): 23119 — from year 1933 to 2025
- NORTON AAF — Weather Bureau Army Navy (WBAN): 23122 — from year 1971 to 2025
- 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
- SAN BERNARDINO INTL — Integrated Surface Dataset (ISD) station ID: 722866 — from year 2010 to 2025
- CORONA MUNICIPAL AIRPORT — Integrated Surface Dataset (ISD) station ID: 720333 — Weather Bureau Army Navy (WBAN): 53175 — from year 2011 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
- RIVERSIDE/MARCH AFB — Integrated Surface Dataset (ISD) station ID: 722860 — from year 2000 to 2004
- 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 2001
- ONTARIO — Integrated Surface Dataset (ISD) station ID: 722865 — Weather Bureau Army Navy (WBAN): 93180 — from year 1943 to 1999
- SAN BERNARDINO INTERNATIONAL — Integrated Surface Dataset (ISD) station ID: 722866 — Weather Bureau Army Navy (WBAN): 23122 — from year 1944 to 1993
- ONTARIO INTERNATIONAL ARPT — Weather Bureau Army Navy (WBAN): 03102 — from year 1968 to 1973