Historical clue formulations

• Like some pets and pools — 2025-06-15
• Sheltered, in a way — 2025-03-08
• Like some cats and plumbing — 2023-08-31
• Opposite of alfresco — 2019-10-28
• Like winter soccer, most likely — 2016-10-26
• Like many rainy-day activities — 2014-09-30
• ___ plumbing — 2012-11-20
• Enclosed — 2010-06-26
• Like much plumbing — 2009-08-15
• Like fireworks, infrequently — 2009-03-19
• Not outside — 2006-01-31
• Away from the elements — 2006-01-22
• Suitable for rainy days — 2004-05-16
• Like most plumbing nowadays — 2004-03-17
• Kind of plumbing — 2003-04-01
• Like some pools — 2003-02-20
• Not alfresco — 2000-04-24
• Like some pools or paint — 1999-04-13
• Protected from the elements — 1999-03-10
• Like some tennis courts — 1999-01-20
• Like some sports — 1998-11-01
• Not alfresco — 1998-04-04
• Not alfresco — 1997-10-12