Meterolological data
Hourly temperature and rainfall data for 2017 were obtained for the whole study period, from the daily Meteorological Office summaries available at www.metoffice.gov.uk/public/weather/observation/gcnjg1jby.
For the analysis, rainfall was quantified as the percentage of the night (to the nearest 10 %) in which rain was detected. In 2017, ambient temperature at midnight (GMT) was the chosen nightly temperature used. For 2018, dusk temperature was also obtained from the Titley Anabat Swift bat detector, and as this proved to be a better predictor of bat activity than midnight temperature (see Results), dusk temperature was used in the analysis of 2018 data.