April Frost Showers

It's been a strange spring. March was stupidly hot, and April seems to have decided to take it's place. We've had snow, and quite a few very hard frosts. The seedlings that were safe in the polytunnel didn't take too kindly to the cold weather, and quite a few have been killed by the frost.
The other day I woke up to see my windows completely covered in beautiful patterns.

I wonder what May will bring?