Chicago received no measurable precipitation between June 1-7 (yeah, technically it's still the 7th for a little while, but it ain't gonna rain).
It is only the 9th time that Chicago has not received at least 0.01" in the first 7 days of June, which makes it close to a 1 in 17 year occurrence on average over the period of record, though it has started happening more often in the past several decades. The other 8 years without measurable precip in the first week of June are 1873, 1922, 1929, 1976, 1988, 1994, 2006, 2017.
Sometimes there is some luck involved -- for example, the unofficial site of Midway Airport had 0.01" between June 1-7. So if we broaden it out to less than 0.10" in the first 7 days of June, that has happened 26 times.