Warmer weather -- upper 50s! It's so much easier riding without all the winter gear.
Though I started wondering, why does it make so much difference? Warm weather: shorts, jersey, 2 socks, 2 shoes, 2 gloves, headband, helmet: 10 items. Cold weather adds: base layer, tights, jacket, change headband and gloves, so only 3 extra items. Why does it feel like it's 100% harder to get dressed/undressed??