- Latitude: 34.095
- Longitude: -117.235
High Temperatures
On May 31 in this location the average high temperature is 81.6 °F (27.6 °C). The lowest recored high temperature was 58.3 °F (14.6 °C) in 1967 and the highest recored high temperature was 102.2 °F (39.0 °C) in 2025. The high temperature is usually* between 75.7 °F (24.3 °C) and 87.6 °F (30.9 °C). About a quarter of the time, the high temperature is less than 75.7 °F (24.3 °C), and another quarter of the time, the high temperature is greater than and 87.6 °F (30.9 °C). About 95% of the time, the high temperature has been between 64.5 °F (18.0 °C) and 98.8 °F (37.1 °C).
Low Temperatures
On May 31 in this location the average low temperature is 54.2 °F (12.3 °C). The lowest recored low temperature was 42.1 °F (5.6 °C) in 1988 and the lowest recored low temperature was 78.1 °F (25.6 °C) in 1984. The low temperature is usually* between 51.4 °F (10.8 °C) and 57.1 °F (13.9 °C). About a quarter of the time, the low temperature is less than 51.4 °F (10.8 °C), and another quarter of the time, the low temperature is greater than and 57.1 °F (13.9 °C). About 95% of the time, the low temperature has been between 46.0 °F (7.8 °C) and 62.4 °F (16.9 °C).
Frost
On May 31 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 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
- 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
- SAN BERNARDINO INTERNATIONAL — Integrated Surface Dataset (ISD) station ID: 722866 — Weather Bureau Army Navy (WBAN): 23122 — from year 1943 to 1993
- BEAUMONT 1 E — Weather Bureau Army Navy (WBAN): 23156 — from year 1948 to 1953