As mentioned above in the stats from LOT... July 2018 was the 7th driest July on record for Chicago, with 1.11" of precip.
Driest Julys On Record:
1. 0.22" - 1936
2. 0.42" - 1934
3. 0.58" - 1874
4. 0.60" - 1894
5. 1.05" - 1887
6. 1.10" - 1941 7. 1.11" - 2018
8. 1.29" - 1940
9. 1.32" - 1991
10. 1.33" - 1945