Detroit averages 13.5 days a year above 90°F, with May the wettest month at 3.49 in of normal rain. The hottest day on record was 103°F on Jun 25, 1988; the coldest, −17°F on Jan 19, 1994. The single biggest 24-hour rain event recorded was 4.07 in on Sep 29, 2016.
Climate and Average Weather Year Round in Detroit
Year-round temperature
In Detroit, the warmest months are June through September, with average daily highs between 74°F and 84°F. The coldest stretch runs December through February, with highs between 32°F and 37°F and overnight lows reaching 20°F.
Rainfall through the year
Rainfall in Detroit averages 2.5 in per month over the long run. May is the wettest at 3.5 in, while February is the driest at 1.4 in.
Days at 90 °F or hotter
Detroit averages 13.5 days per year at 90 °F or hotter. The hottest year on record saw 28 such days (1999); the coolest just 3 (2004).
Precipitation this year
As of May 28, Detroit has received 11.0 in of precipitation this year — 2% above the long-term normal for this point in the year (10.9 in).