Anonymous wrote:barometric pressure, I assume.
Yup. I am headache prone generally and very sensitive to barometric pressure. Though as a migraine sufferer I like it when it rains because a pressure headache is fairly easily addressed with Advil and I am less likely to get migraines when it's overcast (extremely light sensitive and lots of bright sunlight can trigger a migraine or make it "blossom" very quickly).
I am a bit of a hot house flower due to headaches. I wish there was a cure for migraines.