- Latitude: 34.1
- Longitude: -117.783
High Temperatures
On December 12 in this location the average high temperature is 66.6 °F (19.2 °C). The lowest recored high temperature was 39.2 °F (4.0 °C) in 2011 and the highest recored high temperature was 87.8 °F (31.0 °C) in 2010. The high temperature is usually* between 61.3 °F (16.3 °C) and 71.8 °F (22.1 °C). About a quarter of the time, the high temperature is less than 61.3 °F (16.3 °C), and another quarter of the time, the high temperature is greater than and 71.8 °F (22.1 °C). About 95% of the time, the high temperature has been between 51.3 °F (10.7 °C) and 81.8 °F (27.7 °C).
Low Temperatures
On December 12 in this location the average low temperature is 43.1 °F (6.2 °C). The lowest recored low temperature was 23.9 °F (-4.5 °C) in 1993 and the lowest recored low temperature was 59.0 °F (15.0 °C) in 2016. The low temperature is usually* between 39.1 °F (3.9 °C) and 47.2 °F (8.4 °C). About a quarter of the time, the low temperature is less than 39.1 °F (3.9 °C), and another quarter of the time, the low temperature is greater than and 47.2 °F (8.4 °C). About 95% of the time, the low temperature has been between 31.4 °F (-0.3 °C) and 54.9 °F (12.7 °C).
Frost
On December 12 in this location expect the temperatures to drop below freezing for a risk of frost about 3.2% 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:
- MOUNT WILSON — Integrated Surface Dataset (ISD) station ID: 722890 — Weather Bureau Army Navy (WBAN): 93136 — from year 1977 to 2024
- ONTARIO INTERNATIONAL ARPT — Integrated Surface Dataset (ISD) station ID: 747040 — Weather Bureau Army Navy (WBAN): 03102 — from year 2005 to 2024
- CHINO AIRPORT — Integrated Surface Dataset (ISD) station ID: 722899 — Weather Bureau Army Navy (WBAN): 03179 — from year 2006 to 2024
- FULLERTON MUNICIPAL ARPT — Integrated Surface Dataset (ISD) station ID: 722976 — Weather Bureau Army Navy (WBAN): 03166 — 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
- EL MONTE AIRPORT — Integrated Surface Dataset (ISD) station ID: 747043 — Weather Bureau Army Navy (WBAN): 03165 — from year 2012 to 2024
- CABLE — Integrated Surface Dataset (ISD) station ID: 720329 — from year 2017 to 2024
- CORONA MUNI — Integrated Surface Dataset (ISD) station ID: 720333 — from year 2006 to 2016
- FULLERTON MUNICIPAL — Integrated Surface Dataset (ISD) station ID: 722976 — from year 1981 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
- MOUNT WILSON — Integrated Surface Dataset (ISD) station ID: 722890 — from year 2000 to 2001
- 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
- PASADENA — Integrated Surface Dataset (ISD) station ID: 749169 — from year 1943 to 1943