Dayton averages 32.7 days a year above 90°F, with April the wettest month at 4.45 in of normal rain. Across decades of records, Tuesdays are 7% rainier than the weekly average. The hottest day on record was 105°F on Jul 7, 2012; the coldest, −21°F on Jan 20, 1985. The single biggest 24-hour rain event recorded was 4.65 in on Sep 14, 1979.
Climate and Average Weather Year Round in Dayton
Year-round temperature
In Dayton, the warmest months are June through September, with average daily highs between 79°F and 87°F. The coldest stretch runs December through February, with highs between 36°F and 41°F and overnight lows reaching 20°F.
Rainfall through the year
Rainfall in Dayton averages 3.5 in per month over the long run. April is the wettest at 4.5 in, while February is the driest at 2.4 in.
Days at 90 °F or hotter
Dayton averages 32.7 days per year at 90 °F or hotter. The hottest year on record saw 71 such days (2019); the coolest just 9 (1992).
Precipitation this year
As of May 29, Dayton has received 16.1 in of precipitation this year — 9% below the long-term normal for this point in the year (17.6 in).