Ne’er cast a clout ...

“Ne'er cast a clout 'til May be out” refers to the month. Clout is from an Old English word for cloth or clothing, and the saying was a reminder not to be too quick to shuck the winter woollies before the chilly days of May were over. The blossom of the hawthorn is associated with this saying as it’s in bloom now.

They’re quite right - I’ve had my winter clothes and spring clothes alternating daily, or even hourly, this month!