Climate of Joliet, Illinois, USA
Point-value climate at Joliet (Illinois, United States of America). Population approximately 578,460.
Located in Illinois, United States of America, Joliet has a strongly continental climate. Population approximately 578,460. Monthly average temperatures range from -5.5°C / 22.1°F in January to 23.9°C / 75°F in July, with rainfall varying from 36 mm / 1.4 in (February) to 104 mm / 4.1 in (June) — about 937 mm / 36.9 in across the year. These are point-value climate normals sampled at Joliet's coordinates — often quite different from the surrounding region's area-weighted average.
| Month | Temperature | Rainfall | Matches |
|---|---|---|---|
| January | -5.5°C22.1°F | 38 mm1.5″ | Snowy |
| February | -2.5°C27.5°F | 36 mm1.4″ | Snowy |
| March | 3.6°C38.5°F | 69 mm2.7″ | — |
| April | 9.8°C49.6°F | 98 mm3.9″ | — |
| May | 16.1°C61°F | 98 mm3.9″ | — |
| June | 21.5°C70.7°F | 104 mm4.1″ | — |
| July | 23.9°C75°F | 101 mm4″ | — |
| August | 22.8°C73°F | 96 mm3.8″ | — |
| September | 18.6°C65.5°F | 94 mm3.7″ | — |
| October | 11.9°C53.4°F | 67 mm2.6″ | — |
| November | 4.6°C40.3°F | 74 mm2.9″ | — |
| December | -2.1°C28.2°F | 62 mm2.4″ | Snowy |
Frequently asked questions
What is the best time to visit Joliet?
Joliet does not have a clearly "sunny" season by our profile cutoffs — see the "warmest and driest months" fallback for the closest picks. Joliet's warmest month is July at an average of 23.9°C / 75°F, and its driest month is February with about 36 mm / 1.4 in of rain.
What is the climate of Joliet?
Joliet, in Illinois, United States of America, has monthly average temperatures ranging from -5.5°C / 22.1°F in January to 23.9°C / 75°F in July. Annual rainfall is approximately 937 mm / 36.9 in, with the wettest month being June (104 mm / 4.1 in) and the driest February (36 mm / 1.4 in).
What is the average temperature in Joliet in July?
The average temperature in Joliet in July is 23.9°C / 75°F, with rainfall of about 101 mm / 4 in — the warmest month of the year.
When is the driest month in Joliet?
The driest month in Joliet is February, with about 36 mm / 1.4 in of average monthly rainfall. Average temperature that month is -2.5°C / 27.5°F.
When is the wettest month in Joliet?
The wettest month in Joliet is June, with approximately 104 mm / 4.1 in of average monthly rainfall.