Historical clue formulations

• The tropics, for one — 2020-02-01
• General local weather pattern — 2017-07-26
• Region, weatherwise — 2016-05-04
• Iceland has a cold one — 2015-05-08
• The Arctic, for one — 2014-03-25
• The Mediterranean has a warm one — 2012-01-15
• Weather of a region — 2010-02-23
• Area, weatherwise — 2005-12-06
• General weather conditions — 1998-03-17
• Region — 1995-06-24
• Prevailing mood — 1994-03-16