Researchers analyzed data on 604 adults who had been hospitalized for an epileptic seizure, along with meteorological data — temperature, humidity and atmospheric pressure — for a few days before each person’s seizure. During that time, seizures were more likely when atmospheric pressure was low, especially for those with less severe epilepsy (defined as people taking only one ­anti-epileptic medication); high atmospheric pressure decreased the risk for seizure. Seizures also were more common when humidity was high. Temperatures above 68 degrees lessened the chance of a seizure, especially among men.