Historical clue formulations

• Like much of northern Siberia — 2016-01-29
• Like steppes — 2013-05-19
• Completely bare — 2000-03-18
• Like a tundra — 1999-05-01
• Like a tundra — 1998-04-12
• Like steppes — 1996-12-05
• Like a savanna — 1995-01-14