- Latitude: 33.952
- Longitude: -117.439
High Temperatures
On December 9 in this location the average high temperature is 68.3 °F (20.2 °C). The lowest recored high temperature was 46.9 °F (8.3 °C) in 1972 and the highest recored high temperature was 91.0 °F (32.8 °C) in 1950. The high temperature is usually* between 62.8 °F (17.1 °C) and 73.8 °F (23.2 °C). About a quarter of the time, the high temperature is less than 62.8 °F (17.1 °C), and another quarter of the time, the high temperature is greater than and 73.8 °F (23.2 °C). About 95% of the time, the high temperature has been between 52.4 °F (11.3 °C) and 84.3 °F (29.0 °C).
Low Temperatures
On December 9 in this location the average low temperature is 41.8 °F (5.4 °C). The lowest recored low temperature was 17.1 °F (-8.3 °C) in 1971 and the lowest recored low temperature was 60.3 °F (15.7 °C) in 1934. The low temperature is usually* between 37.5 °F (3.1 °C) and 46.1 °F (7.8 °C). About a quarter of the time, the low temperature is less than 37.5 °F (3.1 °C), and another quarter of the time, the low temperature is greater than and 46.1 °F (7.8 °C). About 95% of the time, the low temperature has been between 29.4 °F (-1.4 °C) and 54.2 °F (12.3 °C).
Frost
On December 9 in this location expect the temperatures to drop below freezing for a risk of frost about 6.1% 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:
- MARCH AIR RESERVE BASE — Integrated Surface Dataset (ISD) station ID: 722860 — Weather Bureau Army Navy (WBAN): 23119 — from year 1933 to 2024
- ONTARIO INTERNATIONAL ARPT — Integrated Surface Dataset (ISD) station ID: 747040 — Weather Bureau Army Navy (WBAN): 03102 — from year 2005 to 2024
- RIVERSIDE MUNICIPAL ARPT — Integrated Surface Dataset (ISD) station ID: 722869 — Weather Bureau Army Navy (WBAN): 03171 — from year 2006 to 2024
- CHINO AIRPORT — Integrated Surface Dataset (ISD) station ID: 722899 — Weather Bureau Army Navy (WBAN): 03179 — from year 2006 to 2024
- SAN BERNARDINO INTL — Integrated Surface Dataset (ISD) station ID: 722866 — from year 2009 to 2024
- CORONA MUNICIPAL AIRPORT — Integrated Surface Dataset (ISD) station ID: 720333 — Weather Bureau Army Navy (WBAN): 53175 — from year 2011 to 2024
- CABLE — Integrated Surface Dataset (ISD) station ID: 720329 — from year 2017 to 2024
- NORTON AAF — Weather Bureau Army Navy (WBAN): 23122 — from year 2014 to 2023
- CORONA MUNI — Integrated Surface Dataset (ISD) station ID: 720333 — from year 2006 to 2016
- RIVERSIDE MUNI — Integrated Surface Dataset (ISD) station ID: 722869 — from year 1998 to 2005
- CHINO — Integrated Surface Dataset (ISD) station ID: 722899 — from year 1998 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 2001 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
- SAN BERNARDINO INTERNATIONAL — Integrated Surface Dataset (ISD) station ID: 722866 — Weather Bureau Army Navy (WBAN): 23122 — from year 1943 to 1992
- ONTARIO INTERNATIONAL ARPT — Weather Bureau Army Navy (WBAN): 03102 — from year 1968 to 1972