Franbern
I do know the rule about 'ne'er casting a clout until May is out', BUT last week I did pack away all my winter jumpers, trousers and shoes, and put out Spring and summer clothing and sandals.
Fortunately, 'pack away' just means they are all in the wardrobe in the spare bedroom, so not far away.
I always understood from my Devon family that the "May" referred to is the blossom of Hawthorn, commonly referred to as May. It normally blossoms mid May, rarely at the very beginning of the month. It blossoms when temperatures have risen, hence casting a clout.
Been freezing, cloudburst showers, overcast at times here in the SE. Sunny just now though.