Hartford CT Average Temperatures 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

Hartford Temperatures: Averages by Month

Days of Hot Weather in Hartford

How Often Hartford Has Cold Temperatures

References

More on Weather in Connecticut