Historical clue formulations

• Like watermelons from May to September — 2019-09-25
• Like peaches around summer and early fall — 2018-04-25
• Like pumpkins during the fall — 2016-04-06
• Like strawberries during the summer and apples during the fall — 2015-07-31
• Like clams during winter — 2012-03-23
• Ripe — 2009-09-11
• What oysters "R" during "R" months — 2009-03-25
• Like apples, say, during the fall — 2002-12-17
• At the optimal time — 2002-12-14
• Currently plentiful — 2000-10-04
• Readily gettable — 2000-07-29
• Available, in a way — 2000-06-10
• Available — 1997-02-01
• Generally available — 1996-02-29