Rochester averages 9.3 days a year above 90°F, with July the wettest month at 3.56 in of normal rain. The hottest day on record was 98°F on Jul 20, 1978; the coldest, −19°F on Feb 18, 1979. The single biggest 24-hour rain event recorded was 3.47 in on Sep 14, 1979.
Climate and Average Weather Year Round in Rochester
Year-round temperature
In Rochester, the warmest months are June through September, with average daily highs between 74°F and 83°F. The coldest stretch runs December through February, with highs between 33°F and 39°F and overnight lows reaching 19°F.
Rainfall through the year
Rainfall in Rochester averages 2.9 in per month over the long run. July is the wettest at 3.6 in, while February is the driest at 2.1 in.
Days at 90 °F or hotter
Rochester averages 9.3 days per year at 90 °F or hotter. The hottest year on record saw 27 such days (2016); the coolest just 1 (2009).
Precipitation this year
As of May 28, Rochester has received 18.9 in of precipitation this year — 49% above the long-term normal for this point in the year (12.7 in).