Oh, I turned my heating back on last week -- when it rained every day and it was 8°C on the Wednesday. The week before it was 25° on the Wednesday. I turned the heating off again yesterday, but am regretting it today. More rain. It is supposed to snow at 1200m in the Pyrenees tomorrow.
But, the 10,11,12 of May are called "les saints de glace" in France, and correspond to a period when there is often a cold snap. One is supposed to wait until after them to plant tomatoes, for example. And if any of you plan a trip to France, May is one of the worst months to do so -- it's often rainy and unpredictable.