How is it that Dementors are able to affect the weather when they're breeding? In Half-Blood Prince, Fudge tells the Muggle Prime Minister the strange weather the UK is experiencing is due to the Dementors breeding:
Even the weather was dismal; all this chilly mist in the middle of July ... it wasn’t right, it wasn’t normal ...
Half-Blood Prince - page 8 - British Hardcover
‘But,’ said the Prime Minister, with a sense of dawning horror, ‘didn’t you tell me they’re the creatures that drain hope and happiness out of people?’
‘That’s right. And they’re breeding. That’s what’s causing all this mist.’
Half-Blood Prince - page 20 - British Hardcover
As well, there's this:
J.K. Rowling: Yes, the world seems a much sunnier place (literally – with the Dementors gone the weather gets better!)
J.K. Rowling Web Chat - The Leaky Cauldron - 07.30.07
I understand how Dementors multiply, but I can't quite figure out how the Dementors' breeding would manage to affect the weather. How does it?