Block Island Arpt climate by month
Averages and records for each calendar month at Block Island Arpt, United States, from 1948 to 2026. The warmest month is July, averaging 24.7°C; the coolest is February at 3.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 3.3°C | −3.7°C | 16.7°C14 January 1995 | −21.7°C16 January 1994 | 49 / 49 |
| February | 3.2°C | −3.5°C | 16.7°C27 February 1976 | −18.9°C2 February 1961 | 48 / 48 |
| March | 6.3°C | −0.3°C | 23.3°C30 March 1977 | −13.9°C4 March 1950 | 49 / 49 |
| April | 11.2°C | 4.0°C | 28.9°C20 April 1976 | −7.8°C7 April 1982 | 48 / 48 |
| May | 16.1°C | 8.8°C | 29.4°C22 May 1992 | 1.1°C9 May 1956 | 49 / 49 |
| June | 21.3°C | 13.9°C | 32.8°C24 June 2025 | 5.0°C1 June 1967 | 50 / 50 |
| July | 24.7°C | 17.7°C | 33.3°C8 July 1993 | 10.6°C6 July 1962 | 49 / 49 |
| August | 24.5°C | 17.6°C | 35.0°C26 August 1948 | 7.2°C29 August 1982 | 49 / 49 |
| September | 21.1°C | 14.2°C | 30.6°C1 September 1953 | 3.9°C29 September 1991 | 49 / 51 |
| October | 16.2°C | 9.5°C | 26.7°C1 October 1986 | −2.2°C16 October 1991 | 48 / 48 |
| November | 11.2°C | 4.7°C | 22.2°C9 November 1975 | −8.9°C21 November 1987 | 48 / 49 |
| December | 5.9°C | −1.0°C | 17.8°C8 December 1953 | −20.0°C30 December 1962 | 50 / 50 |
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 48 to 50 years each.
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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.