Query: In what month and year did Plymouth see its highest temperature between 1971 and 2000?
Context: Typically, the warmest day of the year (1971–2000) will achieve a temperature of 26.6 °C (80 °F), although in June 1976 the temperature reached 31.6 °C (89 °F), the site record. On average, 4.25 days of the year will report a maximum temperature of 25.1 °C (77 °F) or above.