New Haven weather by month
Measured at Meriden/Markham Muni
Averages and records for each calendar month at Meriden/Markham Muni, United States, from 1999 to 2026. The warmest month is July, averaging 29.3°C; the coolest is January at 3.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 3.0°C | −7.1°C | 21.7°C6 January 2007 | −25.5°C7 January 2018 | 27 / 27 |
| February | 4.5°C | −6.1°C | 21.1°C21 February 2018 | −23.2°C24 February 2015 | 25 / 27 |
| March | 9.4°C | −1.7°C | 26.1°C22 March 2012 | −18.3°C7 March 2003 | 27 / 27 |
| April | 15.9°C | 3.5°C | 35.0°C17 April 2002 | −6.0°C6 April 2016 | 26 / 26 |
| May | 21.7°C | 9.1°C | 35.6°C26 May 2010 | −2.2°C7 May 2001 | 26 / 26 |
| June | 26.3°C | 14.1°C | 38.3°C24 June 2025 | 2.2°C1 June 2001 | 27 / 27 |
| July | 29.3°C | 17.5°C | 38.9°C6 July 2010 | 7.2°C3 July 2001 | 27 / 27 |
| August | 28.4°C | 16.5°C | 38.9°C9 August 2001 | 7.8°C28 August 2025 | 28 / 28 |
| September | 24.7°C | 12.4°C | 36.1°C8 September 2015 | 0.6°C29 September 2000 | 27 / 28 |
| October | 18.1°C | 5.9°C | 30.6°C6 October 2007 | −6.0°C19 October 2015 | 27 / 27 |
| November | 11.8°C | 0.2°C | 27.8°C1 November 2024 | −12.8°C28 November 2002 | 27 / 27 |
| December | 5.7°C | −3.9°C | 22.2°C6 December 2001 | −19.3°C23 December 2008 | 27 / 27 |
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 25 to 28 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.