Hartford averages 15.8 days a year above 90°F, with October the wettest month at 4.2 in of normal rain. The hottest day on record was 103°F on Aug 9, 2001; the coldest, −16°F on Jan 18, 1997. The single biggest 24-hour rain event recorded was 4.74 in on Sep 16, 1999.
Climate and Average Weather Year Round in Hartford
Year-round temperature
In Hartford, the warmest months are June through September, with average daily highs between 76°F and 85°F. The coldest stretch runs December through February, with highs between 37°F and 42°F and overnight lows reaching 20°F.
Rainfall through the year
Rainfall in Hartford averages 3.6 in per month over the long run. October is the wettest at 4.2 in, while February is the driest at 2.6 in.
Days at 90 °F or hotter
Hartford averages 15.8 days per year at 90 °F or hotter. The hottest year on record saw 40 such days (2016); the coolest just 3 (2026).
Precipitation this year
As of May 28, Hartford has received 13.3 in of precipitation this year — 16% below the long-term normal for this point in the year (15.9 in).