Ingrid Elaine,
Welcome to the Forum!
As you scan these various Forum topics and threads you will find much useful info on camino walking in every season.
Most pilgrims walk during summer and, consequently, that is when every service is thronged with the race for bunks. After the summer crowds have passed many albergues close during winter and early spring for a welcome and necessary rest. However some albergues do stay open throughout the year since there are always some pilgrims walking every day .
One never knows what the weather will be. March and April are NOT necessarily 'balmy' or mild!! This past winter/early spring the Napoleon route from SJPdP to Roncevalles was filled with several meters of snow which continued during March and in effect was closed to pilgrims thus necessitating the use of the Valcarlos alternate. You can read about this hazardous situation in this Forum topic. >>
http://www.caminodesantiago.me/board/el-camino-frances/topic16961.html
Bad weather, ie fog, heavy rain, and hail can occur in ANY season; many steep descents on the camino would then be treacherous and following smaller parallel roads might be necessary. D ifficult stretches after storms might be from Najera to Santo Domingo de la Calzada or across the Montes de Oca from Villafranca as well as Monte Irago and, of course, O Cebreiro.
Sillydoll who is a Forum member has compiled encyclopedic information on Winter Walking at >>
[URL='http://amawalker.blogspot.fr/...er.blogspot.fr/2009/10/walking-in-winter.html[/URL] Another good account of winter walking by a Forum member is the earlier 2013 blog
http://agoodwalkunspoiled.blogspot.com/.
Whenever you choose to walk whatever the season the Camino is a very special experience; nevertheless you must BE PREPARED.
Happy planning and Buen Camino,
Margaret Meredith