- Latitude: 34.095
- Longitude: -117.235
High Temperatures
On September 12 in this location the average high temperature is 91.0 °F (32.8 °C). The lowest recored high temperature was 73.0 °F (22.8 °C) in 1976 and the highest recored high temperature was 114.1 °F (45.6 °C) in 1971. The high temperature is usually* between 85.5 °F (29.7 °C) and 96.5 °F (35.9 °C). About a quarter of the time, the high temperature is less than 85.5 °F (29.7 °C), and another quarter of the time, the high temperature is greater than and 96.5 °F (35.9 °C). About 95% of the time, the high temperature has been between 75.0 °F (23.9 °C) and 107.1 °F (41.7 °C).
Low Temperatures
On September 12 in this location the average low temperature is 60.0 °F (15.6 °C). The lowest recored low temperature was 43.0 °F (6.1 °C) in 1985 and the lowest recored low temperature was 75.9 °F (24.4 °C) in 1959. The low temperature is usually* between 56.0 °F (13.3 °C) and 64.1 °F (17.8 °C). About a quarter of the time, the low temperature is less than 56.0 °F (13.3 °C), and another quarter of the time, the low temperature is greater than and 64.1 °F (17.8 °C). About 95% of the time, the low temperature has been between 48.4 °F (9.1 °C) and 71.7 °F (22.1 °C).
Frost
On September 12 in this location expect the temperatures to drop below freezing for a risk of frost about 0.0% 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 2024
- NORTON AAF — Weather Bureau Army Navy (WBAN): 23122 — from year 2014 to 2024
- RIVERSIDE MUNICIPAL ARPT — Integrated Surface Dataset (ISD) station ID: 722869 — Weather Bureau Army Navy (WBAN): 03171 — from year 2006 to 2024
- SAN BERNARDINO INTL — Integrated Surface Dataset (ISD) station ID: 722866 — from year 2009 to 2024
- SAN BERNARDINO INTERNATIONAL — Integrated Surface Dataset (ISD) station ID: 722866 — Weather Bureau Army Navy (WBAN): 23122 — from year 1943 to 2013
- RIVERSIDE MUNI — Integrated Surface Dataset (ISD) station ID: 722869 — from year 1998 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 2001 to 2004
- BEAUMONT — Integrated Surface Dataset (ISD) station ID: 722867 — from year 2000 to 2000
- 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 1952