Hartford - Hottest Decades





Ranked here are the hottest decades on record for Hartford, Connecticut. The lists include decades when Hartford had the highest average temperatures, the most hot days and the fewest cold days. These extremes are for temperatures observed at Bradley International Airport near Hartford and cover seven decades, from the 1950s to the 2010s.

That is when Hartford had weather measurements that are consistent and complete enough to compare decades. Each decade comprises a standard 10-year range. For instance, the 1990s includes measurements from Jan 1, 1990 to Dec 31, 1999. An exception is the 2010s which so far includes data to the end of 2018. Links to the data behind these lists are in the References section on this page.

Hottest High Temperatures

Average daily maximum temperature at Hartford
High °F Decade High °C
Highest 62.0 2010s 16.7
Runner-up 61.0 1990s 16.1

Warmest Low Temperatures

Average daily minimum temperature at Hartford
Low °F Decade Low °C
Highest 41.6 2010s 5.3
Runner-up 40.7 1990s 4.8

Most Warm Days

Total days per year on average when Hartford had temperatures of at least 70 °F (21 °C)
Days Decade
Highest 153 2010s
Runner-up 147 1970s

Most Hot Days

Total days per year on average when Hartford had temperatures of at least 90 °F (32 °C)
Days Decade
Highest 23 2010s
Runner-up 22 1970s

Fewest Freezing Days

Total days per year on average when Hartford had temperatures of 32 °F (0 °C) or lower
Days Decade
Lowest 123 2010s
Runner-up 126 1990s

Fewest Cold Days

Total days per year on average when Hartford had temperatures of 0 °F (-18 °C) or lower
Days Decade
Lowest 3 2010s, 1990s
Runner-up 4 2000s

How Much Hotter are 2010s?

Compared with averages for the previous 50 years (1960 to 2009), the 2010s in Hartford had:

  • 10 more days each year with temperatures of 70 °F and higher
  • 1.6 °F higher daily maximum temperatures (0.9 °C)
  • 1.7 °F higher daily minimum temperatures (1.0 °C)
  • 9 fewer days a year with freezing temperatures
References

Current Results. 2019. Hartford CT Temperature Averages by Decade

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Year, Version 1.0. NOAA National Centers for Environmental Information.

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