- Latitude: 34.1
- Longitude: -117.783
High Temperatures
On December 14 in this location the average high temperature is 66.8 °F (19.3 °C). The lowest recored high temperature was 29.1 °F (-1.6 °C) in 1987 and the highest recored high temperature was 84.9 °F (29.4 °C) in 2017. The high temperature is usually* between 61.3 °F (16.3 °C) and 72.2 °F (22.3 °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 72.2 °F (22.3 °C). About 95% of the time, the high temperature has been between 51.0 °F (10.6 °C) and 82.5 °F (28.1 °C).
Low Temperatures
On December 14 in this location the average low temperature is 42.2 °F (5.7 °C). The lowest recored low temperature was 19.4 °F (-7.0 °C) in 2008 and the lowest recored low temperature was 60.1 °F (15.6 °C) in 1953. The low temperature is usually* between 38.3 °F (3.5 °C) and 46.2 °F (7.9 °C). About a quarter of the time, the low temperature is less than 38.3 °F (3.5 °C), and another quarter of the time, the low temperature is greater than and 46.2 °F (7.9 °C). About 95% of the time, the low temperature has been between 30.7 °F (-0.7 °C) and 53.7 °F (12.1 °C).
Frost
On December 14 in this location expect the temperatures to drop below freezing for a risk of frost about 4.1% 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:
- 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
- ONTARIO — Integrated Surface Dataset (ISD) station ID: 722865 — from year 2000 to 2000
- MOUNT WILSON — Integrated Surface Dataset (ISD) station ID: 722890 — 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