Hartford weather by month
Measured at Hartford/Brainard Arpt
Averages and records for each calendar month at Hartford/Brainard Arpt, United States, from 1920 to 2026. The warmest month is July, averaging 28.8°C; the coolest is January at 2.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 2.1°C | −7.2°C | 21.7°C6 January 2007 | −27.2°C22 January 1961 | 107 / 107 |
| February | 3.4°C | −6.4°C | 23.3°C25 February 1985 | −31.1°C16 February 1943 | 105 / 107 |
| March | 8.4°C | −1.9°C | 30.0°C29 March 1945 | −20.0°C6 March 1948 | 105 / 106 |
| April | 15.0°C | 3.5°C | 34.4°C17 April 2002 | −13.3°C4 April 1997 | 104 / 105 |
| May | 21.3°C | 9.1°C | 37.2°C21 May 1996 | −6.7°C1 May 1997 | 105 / 106 |
| June | 26.1°C | 14.4°C | 37.8°C26 June 1952 | −1.1°C6 June 1997 | 104 / 105 |
| July | 28.8°C | 17.5°C | 39.4°C22 July 2011 | 5.0°C8 July 1984 | 105 / 106 |
| August | 27.8°C | 16.5°C | 39.4°C9 August 2001 | 3.3°C25 August 1940 | 106 / 106 |
| September | 23.8°C | 12.0°C | 38.3°C2 September 1953 | −1.7°C27 September 1957 | 102 / 105 |
| October | 17.7°C | 5.8°C | 31.7°C1 October 1927 | −8.9°C27 October 1996 | 103 / 104 |
| November | 11.0°C | 0.9°C | 28.3°C2 November 1950 | −15.0°C17 November 1996 | 104 / 106 |
| December | 4.5°C | −4.5°C | 23.9°C8 December 1998 | −24.4°C30 December 1933 | 104 / 105 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 102 to 107 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.