April, when all four seasons happen in one day
Short answer: Three thin layers and a light jacket cover five to eighteen degrees. It is the only system that handles a day starting in frost and ending in sunshine.
Morning and afternoon are two seasons
Frost in the morning, eighteen degrees in the afternoon. Without layers you are dressed wrong for half the day. See bamboo clothing for women.
The base layer stays the same all day
Only the outer layers change. The base layer has to move moisture from the morning ride to the afternoon sun. See bamboo undershirts for women.
Something you can carry
A layer you can tie around your waist or put in a bag is more useful than a thick coat. See bamboo t-shirts for women.
Socks change first
Switch to thinner socks before you change jacket. Feet notice the season first. See bamboo socks for women.
Frequently asked questions
How should you dress in April?
Three thin layers and a light jacket. That covers the day's whole temperature range.
When should the winter coat go away?
When daytime temperatures stay above ten degrees. Before that, layers are more practical.
What changes first in spring?
Socks and the outer layer. The base layer can stay the same all year.