Funny weather

Well the fog that persisted since yesterday morning has just lifted, and now it's beautifully warm and sunny. When I think about it, something odd has happened with the weather this year, and it seems to be confusing the flora and fauna. Just now, I saw a small tortoiseshell butterfly basking in the sun as I returned from the supermarket. In the last few days I have seen snowdrops, azaleas, roses and chrysanthemums all in bloom.
What is going on? It just ain't natural.