Hyannis/Barnstable Muni weather by month
Averages and records for each calendar month at Hyannis/Barnstable Muni, United States, from 1998 to 2026. The warmest month is July, averaging 26.5°C; the coolest is January at 3.8°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 3.8°C | −4.6°C | 17.8°C12 January 2020 | −21.7°C16 January 2004 | 29 / 29 |
| February | 4.5°C | −4.3°C | 17.2°C25 February 2017 | −22.1°C21 February 2015 | 28 / 29 |
| March | 7.6°C | −0.9°C | 22.2°C21 March 2012 | −18.2°C7 March 2015 | 29 / 29 |
| April | 12.5°C | 3.5°C | 30.0°C17 April 2002 | −6.6°C2 April 2015 | 29 / 29 |
| May | 17.8°C | 8.9°C | 31.7°C25 May 2007 | −2.8°C7 May 2001 | 29 / 29 |
| June | 22.8°C | 14.2°C | 33.3°C21 June 2012 | 2.2°C2 June 2026 | 29 / 29 |
| July | 26.5°C | 18.1°C | 37.8°C5 July 1999 | 7.8°C21 July 2000 | 29 / 29 |
| August | 26.0°C | 17.4°C | 35.0°C2 August 2006 | 7.2°C25 August 2004 | 29 / 29 |
| September | 22.5°C | 13.3°C | 32.2°C1 September 2010 | 0.6°C30 September 2000 | 28 / 29 |
| October | 16.9°C | 7.7°C | 29.4°C9 October 2011 | −3.9°C31 October 2001 | 28 / 28 |
| November | 11.6°C | 2.6°C | 23.3°C7 November 2020 | −10.0°C25 November 2000 | 27 / 28 |
| December | 6.8°C | −1.6°C | 19.4°C4 December 1998 | −14.4°C25 December 1999 | 28 / 28 |
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 27 to 29 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.