Why is it?

We have had some lovely sunny and hot weather over the last few weeks. Great! Then why is it that as I picked the children up from school on Friday afternoon and we got into the car to go camping it started to rain? Why is it that after we put the tent up in a field in Derbyshire (at least it didn't rain putting the tent up), a cool breeze got up and every one of us had 6 layers on and in one case a woolly hat and gloves? Why is it that the sun never came out all weekend? Why is it that as we took the tent down it started to rain and why is it that as we got up this morning for the start of the working and school week the sun and blue skies dared to appear. And why is it that I have agreed to go camping again for two nights in August?