- Latitude: 42.121
- Longitude: -87.905
High Temperatures
On March 21 in this location the average high temperature is 48.3 °F (9.0 °C). The lowest recored high temperature was 19.9 °F (-6.7 °C) in 1965 and the highest recored high temperature was 87.1 °F (30.6 °C) in 2012. The high temperature is usually* between 40.9 °F (4.9 °C) and 55.7 °F (13.2 °C). About a quarter of the time, the high temperature is less than 40.9 °F (4.9 °C), and another quarter of the time, the high temperature is greater than and 55.7 °F (13.2 °C). About 95% of the time, the high temperature has been between 26.8 °F (-2.9 °C) and 69.7 °F (21.0 °C).
Low Temperatures
On March 21 in this location the average low temperature is 30.6 °F (-0.8 °C). The lowest recored low temperature was 8.1 °F (-13.3 °C) in 1986 and the lowest recored low temperature was 64.0 °F (17.8 °C) in 2012. The low temperature is usually* between 24.9 °F (-4.0 °C) and 36.3 °F (2.4 °C). About a quarter of the time, the low temperature is less than 24.9 °F (-4.0 °C), and another quarter of the time, the low temperature is greater than and 36.3 °F (2.4 °C). About 95% of the time, the low temperature has been between 14.0 °F (-10.0 °C) and 47.2 °F (8.4 °C).
Frost
On March 21 in this location expect the temperatures to drop below freezing for a risk of frost about 56.6% 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:
- CHICAGO O'HARE INTERNATIONAL — Integrated Surface Dataset (ISD) station ID: 725300 — Weather Bureau Army Navy (WBAN): 94846 — from year 1947 to 2025
- PALWAUKEE MUNICIPAL ARPT — Integrated Surface Dataset (ISD) station ID: 744665 — Weather Bureau Army Navy (WBAN): 04838 — from year 2006 to 2025
- WAUKEGAN HARBOR — Integrated Surface Dataset (ISD) station ID: 997735 — from year 2007 to 2025
- FOSTER AVE CHICAGO — Integrated Surface Dataset (ISD) station ID: 998497 — from year 2015 to 2019
- PALWAUKEE MUNI — Integrated Surface Dataset (ISD) station ID: 744665 — from year 1996 to 2005
- ANN ARBOR MUNICIPAL — Integrated Surface Dataset (ISD) station ID: 725374 — from year 1999 to 2005
- CHIGAGO-WAUKEE ARPT — Integrated Surface Dataset (ISD) station ID: 725339 — from year 2002 to 2002
- NAVAL AIR STATION — Integrated Surface Dataset (ISD) station ID: 725306 — Weather Bureau Army Navy (WBAN): 14855 — from year 1973 to 1994
- WILMETTE (MARINES)& — Integrated Surface Dataset (ISD) station ID: 725307 — from year 1976 to 1994
- WILMETTE (CGS) — Integrated Surface Dataset (ISD) station ID: 722417 — from year 1989 to 1990
- NAVAL AIR STATION — Weather Bureau Army Navy (WBAN): 14855 — from year 1945 to 1972
- CHICAGO OHARE INTL AP — Weather Bureau Army Navy (WBAN): 94846 — from year 1970 to 1972
- PARK RIDGE AF — Weather Bureau Army Navy (WBAN): 14810 — from year 1949 to 1958