The statewide average temperature for July 1-22, 2010, in Illinois is 77.2 degrees, 1.1 degrees above normal for this time period. The state average precipitation for the same period is 3.46 inches, 0.70 inches above normal.
Northern and eastern Illinois are a little drier on average. However, even those drier areas contain locations with very impressive rainfall amounts.
Table 1. Temperature and precipitation amounts and departures from normal by climate division in Illinois for July 1-22, 2010. A map of the climate divisions can be seen below the table.
| Climate Division | Temperature (F) | Depart (F) | Rainfall (in) | Depart (in) |
| Northwest | 75.2 | 1.2 | 1.96 | -0.86 |
| Northeast | 76.2 | 2.3 | 1.44 | -1.41 |
| West | 76.9 | 0.4 | 6.54 | 3.58 |
| Central | 76.7 | 1.1 | 2.85 | 0.04 |
| East | 76.2 | 1.2 | 2.08 | -0.88 |
| South Southwest | 77.5 | 0.4 | 5.05 | -0.88 |
| South Southeast | 78.0 | 0.9 | 5.10 | 2.25 |
| Southwest | 79.3 | 1.0 | 2.89 | 0.39 |
| Southeast | 79.3 | 1.0 | 2.90 | 0.39 |
| State | 77.2 | 1.1 | 3.46 | 0.70 |
