The wet weather in 2012 dampened the spirits for many but Butterflies that feed on grasses benefited greatly from drizzly Britain.
The year, which started with hot weather, saw incessant rain from April which prompted substantial grass growth that benefited species such as meadow browns, ringlets and gatekeeper butterflies.
But most butterfly species struggled in the constantly wet and cool conditions.
The Wider Countryside Butterfly Survey recorded 18,500 meadow brown butterflies across 700 1km squares in the UK countryside in 2012, almost twice as many as in 2011 and the most counted in the four years the study has been running.
Butterfly numbers fell by more than a fifth across the UK countryside last year, a study has revealed.
The 22% drop in butterflies in 2011 is thought to be the result of an unusually cold summer and the ongoing deterioration of suitable habitat for the insects, wildlife charity Butterfly Conservation said.