- Latitude: 33.952
- Longitude: -117.439
High Temperatures
On January 9 in this location the average high temperature is 66.1 °F (18.9 °C). The lowest recored high temperature was 48.4 °F (9.1 °C) in 1937 and the highest recored high temperature was 86.0 °F (30.0 °C) in 1990. The high temperature is usually* between 60.6 °F (15.9 °C) and 71.6 °F (22.0 °C). About a quarter of the time, the high temperature is less than 60.6 °F (15.9 °C), and another quarter of the time, the high temperature is greater than and 71.6 °F (22.0 °C). About 95% of the time, the high temperature has been between 50.1 °F (10.1 °C) and 82.0 °F (27.8 °C).
Low Temperatures
On January 9 in this location the average low temperature is 41.0 °F (5.0 °C). The lowest recored low temperature was 25.3 °F (-3.7 °C) in 1937 and the lowest recored low temperature was 66.2 °F (19.0 °C) in 2007. The low temperature is usually* between 36.7 °F (2.6 °C) and 45.2 °F (7.3 °C). About a quarter of the time, the low temperature is less than 36.7 °F (2.6 °C), and another quarter of the time, the low temperature is greater than and 45.2 °F (7.3 °C). About 95% of the time, the low temperature has been between 28.6 °F (-1.9 °C) and 53.3 °F (11.8 °C).
Frost
On January 9 in this location expect the temperatures to drop below freezing for a risk of frost about 7.7% 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 2015 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 1972