Shalom Maureen and Greetings from Jerusalem!
I can only agree with Falcon on this one, February/March will probably be a winter slog-snow leaving St Jean and snow climbing to O'Cebeiro-the older albergues freezing cold. I always walk over Easter, the holiday in Spain is marvelous! The towns and villages are usually all spruced up for the occasion, many flowers in the churches, and one never knows when you might chance upon a procession, night or day, costumes, conical hoods, the relics and statues of the church taken out for a holiday spin around town, good food, it is a special time to be on the Camino. Plus! Starting Easter usually means that the Spring will follow you across Northern Spain. In Navarra the vineyards are just pushing out leaves on the grape vines, the last of the narcissus and the first of the pansies, wheat knee high turning the fields and hills around a wonderful Irish green, Castilla and Leon are warmer, the wheat is higher, the vineyards all green with first flowers to attract the bees. The Meseta may be green, as you approach Galicia the hills run riot with wild flowers, entire hills colored blue with lobelia, gorse and azaleas everywhere, yellow broom, the rare and protected wild primrose, wisteria as you enter villages along with tulips, clarkia roses, and more pansies, many many others which I recognise but have not the names. Give your dates a second thought and re-plan if you can-this is a sight you should not miss.