Hoar frost on May the first, indicates a good harvest.

An east wind in May, it's your duty to pray.

Thunderstorms in May and the farmer sings 'Hey, Hey'

11th - 13th May do not pass without a frost

17th - 19th May occasions a cold blast of air blighting apple trees.

Warwick April 2008
Avg 9.0C (1C higher than 30 yr avg for this area)
65mm rain (40% higher)