- Latitude: 34.056
- Longitude: -117.6
High Temperatures
On December 12 in this location the average high temperature is 68.0 °F (20.0 °C). The lowest recored high temperature was 50.0 °F (10.0 °C) in 2022 and the highest recored high temperature was 87.8 °F (31.0 °C) in 2010. The high temperature is usually* between 63.0 °F (17.2 °C) and 73.0 °F (22.8 °C). About a quarter of the time, the high temperature is less than 63.0 °F (17.2 °C), and another quarter of the time, the high temperature is greater than and 73.0 °F (22.8 °C). About 95% of the time, the high temperature has been between 53.4 °F (11.9 °C) and 82.6 °F (28.1 °C).
Low Temperatures
On December 12 in this location the average low temperature is 42.9 °F (6.1 °C). The lowest recored low temperature was 26.1 °F (-3.3 °C) in 2024 and the lowest recored low temperature was 59.0 °F (15.0 °C) in 1996. The low temperature is usually* between 38.4 °F (3.6 °C) and 47.4 °F (8.5 °C). About a quarter of the time, the low temperature is less than 38.4 °F (3.6 °C), and another quarter of the time, the low temperature is greater than and 47.4 °F (8.5 °C). About 95% of the time, the low temperature has been between 29.9 °F (-1.1 °C) and 55.9 °F (13.3 °C).
Frost
On December 12 in this location expect the temperatures to drop below freezing for a risk of frost about 5.0% 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 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
- CORONA MUNICIPAL AIRPORT — Integrated Surface Dataset (ISD) station ID: 720333 — Weather Bureau Army Navy (WBAN): 53175 — from year 2011 to 2024
- BRACKETT FIELD AIRPORT — Integrated Surface Dataset (ISD) station ID: 722887 — Weather Bureau Army Navy (WBAN): 03180 — from year 2012 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
- 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
- ONTARIO INTERNATIONAL ARPT — Weather Bureau Army Navy (WBAN): 03102 — from year 1968 to 1972