Monkey Weather

When we were children, my brother and I used to say that when it was raining and sunny at the same time, that it was 'Monkey Weather'.

I can't for the life of me remember why!

Edit: My lovely mum has just informed me that the reason I called it Monkey Weather is that apparently, a 'Monkey's Birthday' is "characterised by rain and sun at the same time" - she sent me this link to urban dictionary. I'm glad my mum has a better memory than I do!