Plymouth:

Typically, the warmest day of the year (19712000) 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