Pack or skip
Insect repellent for Chicago in May
Verdict
Pack it
Warm (70°F) plus 11 rainy days = mosquito conditions.
Why
Chicago in May averages highs of 70°F, lows of 51°F, 11 rainy days.
That climate means insect repellent earns its space in the bag. Warm (70°F) plus 11 rainy days = mosquito conditions.