The conventional wisdom among UK butterfly enthusiasts is that cold winters are generally good for butterflies. However, until recently there was little scientific evidence to support this perception. Indeed, previous analyses correlating butterfly population size measured by the UK Butterfly Monitoring Scheme (UKBMS) with weather data had concluded that warm summer weather was the key positive factor associated with numbers of adult butterflies in most species
Click on the link to read the rest of the article: Butterfly Conservation – Cold comfort