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Patients with migraine who are asked about their headache triggers often mention weather change as a factor. However, the literature on weather and migraine is scarce, and the results are inconsistent. In this prospective study, 238 patients with diagnoses of migraine or probable migraine completed daily headache diaries for almost 90 days, thus providing about 20,550 patient-days of data. In the diaries, patients answered 59 questions that addressed occurrence and duration of headache and other features, including descriptions that allowed specific identification of migraines; 7 of the questions were related to weather perception. The authors obtained objective local weather parameters, including 11 individual meteorologic parameters and 1…