In February 2020 researchers from Japan published the results of their study to assess whether the weather is a significant risk factor for the onset of stroke. Five-year information on stroke onset was collected via ambulance transportation data and analysed against weather information, including average temperature, average air pressure and humidity provided by the Japan Meteorological Agency. Over the 5-year period there were 5,501 occurrences of ambulance transportation due to stroke. Results showed that both a lower temperature and a reduction in temperature, as well as a radical humidity change appeared to be associated with an increased risk of stroke.
Matsumaru N et al. Weather Fluctuations May Have an Impact on Stroke Occurrence in a Society: A Population-Based Cohort Study. Cerebrovasc Dis Extra. 2020 Feb 5;10(1):1-10.