Historical clue formulations

• Created unpleasant driving conditions, in a way — 2025-11-14
• Rained pellets — 2009-06-16
• Fell hard? — 2005-07-29
• Made the roads slick — 2001-03-18
• Rained hard? — 2000-04-16
• Came down pretty hard — 1998-04-04
• Precipitated, in a way — 1994-12-15