- Latitude: 34.1
- Longitude: -117.25
High Temperatures
On March 31 in this location the average high temperature is 72.1 °F (22.3 °C). The lowest recored high temperature was 46.9 °F (8.3 °C) in 1949 and the highest recored high temperature was 97.0 °F (36.1 °C) in 2011. The high temperature is usually* between 66.0 °F (18.9 °C) and 78.3 °F (25.7 °C). About a quarter of the time, the high temperature is less than 66.0 °F (18.9 °C), and another quarter of the time, the high temperature is greater than and 78.3 °F (25.7 °C). About 95% of the time, the high temperature has been between 54.3 °F (12.4 °C) and 90.0 °F (32.2 °C).
Low Temperatures
On March 31 in this location the average low temperature is 46.0 °F (7.8 °C). The lowest recored low temperature was 30.9 °F (-0.6 °C) in 1949 and the lowest recored low temperature was 59.0 °F (15.0 °C) in 1981. The low temperature is usually* between 42.7 °F (6.0 °C) and 49.2 °F (9.6 °C). About a quarter of the time, the low temperature is less than 42.7 °F (6.0 °C), and another quarter of the time, the low temperature is greater than and 49.2 °F (9.6 °C). About 95% of the time, the low temperature has been between 36.6 °F (2.5 °C) and 55.4 °F (13.0 °C).
Frost
On March 31 in this location expect the temperatures to drop below freezing for a risk of frost about 0.2% 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
- 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
- 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
- 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