- Latitude: 34.095
- Longitude: -117.235
High Temperatures
On January 21 in this location the average high temperature is 64.0 °F (17.8 °C). The lowest recored high temperature was 37.4 °F (3.0 °C) in 1937 and the highest recored high temperature was 84.0 °F (28.9 °C) in 2014. The high temperature is usually* between 58.3 °F (14.6 °C) and 69.7 °F (21.0 °C). About a quarter of the time, the high temperature is less than 58.3 °F (14.6 °C), and another quarter of the time, the high temperature is greater than and 69.7 °F (21.0 °C). About 95% of the time, the high temperature has been between 47.5 °F (8.6 °C) and 80.6 °F (27.0 °C).
Low Temperatures
On January 21 in this location the average low temperature is 40.7 °F (4.9 °C). The lowest recored low temperature was 25.0 °F (-3.9 °C) in 1966 and the lowest recored low temperature was 58.3 °F (14.6 °C) in 1969. The low temperature is usually* between 36.5 °F (2.5 °C) and 45.0 °F (7.2 °C). About a quarter of the time, the low temperature is less than 36.5 °F (2.5 °C), and another quarter of the time, the low temperature is greater than and 45.0 °F (7.2 °C). About 95% of the time, the low temperature has been between 28.4 °F (-2.0 °C) and 53.1 °F (11.7 °C).
Frost
On January 21 in this location expect the temperatures to drop below freezing for a risk of frost about 8.3% 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
- 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
- SAN BERNARDINO INTERNATIONAL — Integrated Surface Dataset (ISD) station ID: 722866 — Weather Bureau Army Navy (WBAN): 23122 — from year 1943 to 2014
- 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
- BEAUMONT — Integrated Surface Dataset (ISD) station ID: 722867 — from year 2000 to 2001
- BEAUMONT — Integrated Surface Dataset (ISD) station ID: 722867 — Weather Bureau Army Navy (WBAN): 23156 — from year 1973 to 1999
- BEAUMONT 1 E — Weather Bureau Army Navy (WBAN): 23156 — from year 1948 to 1953