- Latitude: 33.952
- Longitude: -117.439
High Temperatures
On May 19 in this location the average high temperature is 80.6 °F (27.0 °C). The lowest recored high temperature was 57.9 °F (14.4 °C) in 1948 and the highest recored high temperature was 99.1 °F (37.3 °C) in 2008. The high temperature is usually* between 75.3 °F (24.1 °C) and 86.0 °F (30.0 °C). About a quarter of the time, the high temperature is less than 75.3 °F (24.1 °C), and another quarter of the time, the high temperature is greater than and 86.0 °F (30.0 °C). About 95% of the time, the high temperature has been between 65.1 °F (18.4 °C) and 96.2 °F (35.7 °C).
Low Temperatures
On May 19 in this location the average low temperature is 53.2 °F (11.8 °C). The lowest recored low temperature was 38.8 °F (3.8 °C) in 2019 and the lowest recored low temperature was 80.1 °F (26.7 °C) in 1980. The low temperature is usually* between 50.2 °F (10.1 °C) and 56.1 °F (13.4 °C). About a quarter of the time, the low temperature is less than 50.2 °F (10.1 °C), and another quarter of the time, the low temperature is greater than and 56.1 °F (13.4 °C). About 95% of the time, the low temperature has been between 44.6 °F (7.0 °C) and 61.8 °F (16.5 °C).
Frost
On May 19 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
- 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
- CHINO AIRPORT — Integrated Surface Dataset (ISD) station ID: 722899 — Weather Bureau Army Navy (WBAN): 03179 — from year 2006 to 2025
- SAN BERNARDINO INTL — Integrated Surface Dataset (ISD) station ID: 722866 — from year 2009 to 2025
- CORONA MUNICIPAL AIRPORT — Integrated Surface Dataset (ISD) station ID: 720333 — Weather Bureau Army Navy (WBAN): 53175 — from year 2011 to 2025
- CABLE — Integrated Surface Dataset (ISD) station ID: 720329 — from year 2018 to 2025
- CORONA MUNI — Integrated Surface Dataset (ISD) station ID: 720333 — from year 2007 to 2017
- RIVERSIDE MUNI — Integrated Surface Dataset (ISD) station ID: 722869 — from year 1999 to 2005
- CHINO — Integrated Surface Dataset (ISD) station ID: 722899 — 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 2000
- ONTARIO — Integrated Surface Dataset (ISD) station ID: 722865 — Weather Bureau Army Navy (WBAN): 93180 — from year 1943 to 1999
- SAN BERNARDINO INTERNATIONAL — Integrated Surface Dataset (ISD) station ID: 722866 — Weather Bureau Army Navy (WBAN): 23122 — from year 1943 to 1993
- ONTARIO INTERNATIONAL ARPT — Weather Bureau Army Navy (WBAN): 03102 — from year 1968 to 1972