Historical clue formulations

• Warms up — 2026-08-08
• Breaks in winter weather — 2026-07-21
• Becomes less tense — 2024-10-24
• Unfreezes — 2023-09-26
• Warming periods — 2023-01-22
• Warms — 2019-02-16
• Détentes — 2017-02-11
• Spring events — 2013-10-12
• Warming periods — 2013-07-31
• Defrosts — 2012-12-10
• Détentes — 2011-07-17
• Détentes — 2010-07-11
• Unfreezes — 2006-10-03
• Defrosts — 2005-06-29
• Détentes — 2004-08-26
• Loosens up — 2003-04-10
• Warms up — 1996-11-13