- Latitude: 34.1
- Longitude: -117.25
High Temperatures
On January 12 in this location the average high temperature is 65.6 °F (18.7 °C). The lowest recored high temperature was 35.1 °F (1.7 °C) in 1949 and the highest recored high temperature was 87.1 °F (30.6 °C) in 2009. The high temperature is usually* between 59.6 °F (15.4 °C) and 71.5 °F (22.0 °C). About a quarter of the time, the high temperature is less than 59.6 °F (15.4 °C), and another quarter of the time, the high temperature is greater than and 71.5 °F (22.0 °C). About 95% of the time, the high temperature has been between 48.3 °F (9.1 °C) and 82.9 °F (28.3 °C).
Low Temperatures
On January 12 in this location the average low temperature is 41.3 °F (5.2 °C). The lowest recored low temperature was 10.9 °F (-11.7 °C) in 1949 and the lowest recored low temperature was 59.9 °F (15.5 °C) in 1996. The low temperature is usually* between 37.2 °F (2.9 °C) and 45.5 °F (7.5 °C). About a quarter of the time, the low temperature is less than 37.2 °F (2.9 °C), and another quarter of the time, the low temperature is greater than and 45.5 °F (7.5 °C). About 95% of the time, the low temperature has been between 29.3 °F (-1.5 °C) and 53.3 °F (11.9 °C).
Frost
On January 12 in this location expect the temperatures to drop below freezing for a risk of frost about 6.5% 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
- SAN BERNARDINO INTL — Integrated Surface Dataset (ISD) station ID: 722866 — from year 2009 to 2025
- RIVERSIDE MUNI — Integrated Surface Dataset (ISD) station ID: 722869 — 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
- BEAUMONT — Integrated Surface Dataset (ISD) station ID: 722867 — from year 2000 to 2001
- ONTARIO — Integrated Surface Dataset (ISD) station ID: 722865 — Weather Bureau Army Navy (WBAN): 93180 — from year 1943 to 1999
- BEAUMONT — Integrated Surface Dataset (ISD) station ID: 722867 — Weather Bureau Army Navy (WBAN): 23156 — from year 1973 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
- BEAUMONT 1 E — Weather Bureau Army Navy (WBAN): 23156 — from year 1948 to 1953