April 2021 ended up with 17 air frosts and 22 ground frosts, albeit that all were slight.
A combination of dust dry sandy soils in a sheltered river valley location with just about every night being calm, clear and starry. Quite amazing given the proximity of the sea.
No frost damage; apple blossom is weeks behind and the cherry blossom was unaffected. My vines are just starting to bud, normally by now they are in leaf.
This is the most air and ground frosts since December 2010.