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.

All the numbers are long-term historical averages based on climate data gathered from 1981 to 2010.

Average Hartford temperatures
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 late spring through to the end of summer, Hartford has occasional days of 90-degree weather. On only one or two days in a decade does the temperature 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 0 0 0
April 6 1 0
May 17 6 1
June 26 15 3
July 30 24 6
August 30 22 4
September 22 8 1
October 8 1 0
November 1 0 0
December 0 0 0
Year 140 77 15

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 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 8 17 28
February 4 12 25
March 1 6 21
April 0 0 6
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 1 15
December 3 11 26
Year 16 47 125
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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