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Very few studies have looked at longitudinal intraindividual blood pressure responses to weather conditions. There are no data to suggest that specific response to changes in weather will have an impact on survival. We analyzed >169 000 clinic visits of 16 010 Glasgow Blood Pressure Clinic patients with hypertension. Each clinic visit was mapped to the mean West of Scotland monthly weather (temperature, sunshine, rainfall) data. Percentage change in blood pressure was calculated between pairs of consecutive clinic visits, where the weather alternated between 2 extreme quartiles (Q₁–Q₄ or Q₄–Q₁) or remained in the same quartile (Q_n–Q_n) of each weather parameter. Subjects were also categorized into 2 groups depending on whether their blood pressure response in Q₁–Q₄ or Q₄–Q₁ were concordant or discordant to Q_n–Q_n. Generalized estimating equations and Cox proportional hazards model were …