Ann Arbor averages 12.3 days a year above 90°F, with June the wettest month at 4.25 in of normal rain. The hottest day on record was 100°F on Jul 5, 2012; the coldest, −18°F on Feb 20, 2015. The single biggest 24-hour rain event recorded was 5.33 in on Jun 26, 2021.
Climate and Average Weather Year Round in Ann Arbor
Year-round temperature
In Ann Arbor, the warmest months are June through September, with average daily highs between 75°F and 84°F. The coldest stretch runs December through February, with highs between 32°F and 36°F and overnight lows reaching 16°F.
Rainfall through the year
Rainfall in Ann Arbor averages 3.2 in per month over the long run. June is the wettest at 4.3 in, while February is the driest at 2.4 in.
Days at 90 °F or hotter
Ann Arbor averages 12.3 days per year at 90 °F or hotter. The hottest year on record saw 38 such days (2012); the coolest just 1 (2014).
Precipitation this year
As of May 28, Ann Arbor has received 15.2 in of precipitation this year — 3% above the long-term normal for this point in the year (14.8 in).