Dear Sue,
I walked CF in October 2021. Weather wise, you may hit every season in one day, as correctly pointed out by henrythedog. Essential packing is gloves and a buff, a head torch good sweater and rain protection ( Poncho/light raincoat and over trousers). Balance all the above with ‘packing light as possible’ and you will be grand.
Most of all, and I mean this sincerely, be assured that every step taken will add to the most marvellous powerful experience one could ask for, blessed by those you meet along the way. Plan well, prepare for cold and heat within a couple of hours, and set your face like flint towards Santiago, soaking in everything along the way.
Buen camino. X