3-season commuter = fair weather commuter
Spring through Fall, generally. And I look for fair weather during the 3 seasons. If it's raining in the morning or stands a good chance to rain in the PM, then I'll drive.
Haven't been a 4-season, all weather commuter since I lived in Atlanta 25 years ago.
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Bacchetta Giro A20, RANS V-Rex, RANS Screamer