| Month | Average (°F) | Record (°F) | Average (inches) | |||
|---|---|---|---|---|---|---|
| High ☀️ | Low 🌙 | High ☀️ | Low 🌙 | Precipitation 💧 | Snow ❄️ | |
| January | 31.5 | 16.2 | 67 | -26 | 1.9 | 5.7 |
| February | 35.8 | 19.1 | 73 | -20 | 1.8 | 5.1 |
| March | 47.4 | 29.1 | 86 | -8 | 2.2 | 1.9 |
| April | 60.3 | 39.1 | 92 | 11 | 3.7 | 0.1 |
| May | 71.4 | 49.7 | 95 | 26 | 4.5 | 0.0 |
| June | 80.7 | 59.8 | 104 | 35 | 4.1 | 0.0 |
| July | 83.9 | 64.3 | 103 | 44 | 4.6 | 0.0 |
| August | 82.2 | 62.8 | 102 | 39 | 4.0 | 0.0 |
| September | 76.5 | 55.3 | 101 | 28 | 3.2 | 0.0 |
| October | 63.5 | 43.2 | 96 | 15 | 3.0 | 0.0 |
| November | 48.9 | 32.1 | 81 | -10 | 2.4 | 0.3 |
| December | 36.7 | 22.1 | 70 | -20 | 2.0 | 3.8 |
| Entire year | 60.0 | 41.2 | 104 | -26 | 37.1 | 16.7 |
|
More Joliet Weather Records
1893–2024
|
||
|---|---|---|
| Highest daily low | 79 °F | July 24, 2012 |
| Lowest daily high | -13 °F | January 19, 1994 |
| Greatest daily range (Difference of high and low) |
56 °F | November 30, 1946 |
| Greatest difference in daily high over two conscutive days |
51 °F | Jan 19–20, 1996 |
| Most daily precipitation | 13.6 inches | July 18, 1996 |
| Most monthly precipitation | 17.4 inches | July 1996 |
| Most yearly precipitation | 56.1 inches | 1902 |
| Most yearly days with precipitation | 150 | 1993 |
| Earliest snow in season | October 18 | 1972 |
| Latest snow in season | April 23 | 1967 |
| Most daily snow | 10.5 inches | November 5, 1896 |
| Most monthly snow | 26.0 inches | December 2000 |
| Most yearly snow | 50.3 inches | 1951 |
| Most snow in a winter | 55.6 inches | 2013–2014 |
| Greatest snow accumulation | 17.0 inches | December 15, 2000 |
| Earliest freeze | September 18 | 1959 |
| Earliest day ≥ 80 °F | March 16 | 2012 |
| Earliest day ≥ 90 °F | April 17 | 1896 |
| Earliest day ≥ 100 °F | June 10 | 1895 |
| Latest freeze | May 23 | 1963 |
| Latest day ≥ 80 °F | November 1 | 1968 |
| Latest day ≥ 90 °F | October 15 | 1897 |
| Latest day ≥ 100 °F | September 13 | 1897 |
| Most days in a year < 0 °F | 33 | 1977 |
| Most days in a year < 32 °F | 148 | 1952 |
| Most days in a year ≥ 80 °F | 131 | 1895 |
| Most days in a year ≥ 90 °F | 73 | 1895 |
| Most days in a year ≥ 100 °F | 7 | 1988 |
|
Joliet Weather Streaks
Most consecutive days...
|
||
|---|---|---|
| With precipitation | 11 days | Oct 23 – Nov 2, 1991 |
| Without precipitation | 35 days | May 25 – Jun 28, 1988 |
| With snow | 6 days | Dec 22–27, 1993 |
| High temperature at or below freezing |
39 days | Jan 10 – Feb 17, 1985 |
| High temperature ≥ 80 °F | 48 days | Jun 10 – Jul 27, 1971 |
| High temperature ≥ 90 °F | 14 days | Jun 22 – Jul 5, 1966 |
| High temperature ≥ 100 °F | 3 days | Jul 6–8, 2012 |