Hartford Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Hartford, Connecticut during each month of the year.

The average high and low temperatures are listed below monthly and annually for the city, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 70, 80 or 90 °F each month in Hartford, scroll down farther. There are also monthly and yearly counts of days with cold weather.

The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1991 to 2020 weather.

10-year temperature averages for Hartford, 2010 to 2019
High °F Low °F   High °C Low °C
35 19 January 2 -7
39 21 February 4 -6
47 28 March 9 -2
61 38 April 16 4
72 48 May 22 9
80 58 June 27 14
85 63 July 30 17
83 62 August 29 17
76 54 September 24 12
64 42 October 18 6
52 33 November 11 1
41 25 December 5 -4
61 41 Year 16 5
30-year temperature averages for Hartford, 1991 to 2020
High °F Low °F   High °C Low °C
35 18 January 1 -8
39 21 February 4 -6
48 28 March 9 -2
61 38 April 16 4
71 48 May 22 9
80 57 June 26 14
85 63 July 29 17
83 61 August 28 16
75 53 September 24 12
63 41 October 17 5
52 33 November 11 1
40 23 December 4 -5
61 40 Year 16 5

Days of Hot Weather in Hartford

From spring through to the end of summer, Hartford has occasional days of 90-degree weather. But it's not normal for the temperature to climb to 100 degrees Fahrenheit (38 °C).

Days per month in Hartford of at least 70, 80 or 90 °F
  70 °F
21 °C
80 °F
27 °C
90 °F
32 °C
January 0 0 0
February 0 0 0
March 1 0 0
April 6 2 0
May 18 7 1
June 27 17 4
July 30 26 8
August 30 23 5
September 24 10 1
October 8 1 0
November 1 0 0
December 0 0 0
Year 146 86 20

How Often Hartford Has Cold Temperatures

Most winter nights at Harford have freezing temperatures. Three of those nights a year, on average, drop down to 0 °F (-18 °C) or less. Below-zero temperatures are most likely to show up in January.

January also has the most days, 12, that stay below freezing all day long. The city averages 28 days a year that never warm up to above 32 °F. A full day of frosty weather can arrive in Hartford as early November, or as late as March.

Days per month on average in Hartford when the minimum temperature drops to 10, 20, or 32 °F or below
  10 °F
-12 °C
20 °F
-8 °C
32 °F
0 °C
January 7 17 27
February 5 13 25
March 1 5 21
April 0 0 7
May 0 0 0
June 0 0 0
July 0 0 0
August 0 0 0
September 0 0 0
October 0 0 4
November 0 2 15
December 2 10 25
Year 15 47 126
References

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

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

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