Plymouth:

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. During the winter half of the year, the coldest night will typically fall to −4.1 °C (25 °F) although in January 1979 the temperature fell to −8.8 °C (16 °F). Typically, 18.6 nights of the year will register an air frost.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". In what month and year did Plymouth see its highest temperature between 1971 and 2000?
June 1976