Humidifiers and Ionizers can help relieve the symptoms of barometric headaches. Having an ionizer or humidifier in your home helps to raise oxygen levels in the body, which can help your weather headache. Especially, as it is the air-pressure change following a weather change, that causes these kind of headaches.

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Many a times the blood vessels try to compensate for the lowered oxygen level by contracting and expanding. This exertion leads to migraine.

Headaches and migraines can be the resultant of many factors – like high temperature and humidity, overcast skies, etc. etc.

Weather changes sometimes also effect chemical changes in the body, which again trigger headaches and migraines.

Electrically charged air very often sets off a bad headache.

From:
Depresson Guide.com