I think winds affect my biking regardless of what direction they're coming from. This morning, for example, in calm winds, I set three personal records on a 60 km ride: best distance over 1 hour (30.9 km); best time for 40 km (1:18:14, beating my previous PR by 4:01); and best time for 60 km (1:58:28, beating my previous by 3:22).
Next week I'm planning to ride 110—120 km as part of my North Shore Century training. Maybe another PR or two?