- Latitude: 34.1
- Longitude: -117.25
High Temperatures
On January 4 in this location the average high temperature is 64.1 °F (17.8 °C). The lowest recored high temperature was 36.0 °F (2.2 °C) in 1949 and the highest recored high temperature was 89.1 °F (31.7 °C) in 2012. The high temperature is usually* between 58.4 °F (14.7 °C) and 69.8 °F (21.0 °C). About a quarter of the time, the high temperature is less than 58.4 °F (14.7 °C), and another quarter of the time, the high temperature is greater than and 69.8 °F (21.0 °C). About 95% of the time, the high temperature has been between 47.6 °F (8.7 °C) and 80.6 °F (27.0 °C).
Low Temperatures
On January 4 in this location the average low temperature is 39.8 °F (4.3 °C). The lowest recored low temperature was 22.1 °F (-5.5 °C) in 1970 and the lowest recored low temperature was 60.1 °F (15.6 °C) in 1969. The low temperature is usually* between 35.4 °F (1.9 °C) and 44.2 °F (6.8 °C). About a quarter of the time, the low temperature is less than 35.4 °F (1.9 °C), and another quarter of the time, the low temperature is greater than and 44.2 °F (6.8 °C). About 95% of the time, the low temperature has been between 27.0 °F (-2.8 °C) and 52.5 °F (11.4 °C).
Frost
On January 4 in this location expect the temperatures to drop below freezing for a risk of frost about 11.6% 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 2010 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