Spring set to be the coldest for 50 years

I read this in the Metro on the way up to London Bridge Railway Station, mow I know why my seedlings and young plants are looking sad being outside.

Source http://metro.co.uk/2013/05/30/spring-set-to-be-the-coldest-for-50-years-but-sunshine-to-return-for-the-weekend-3821024/