Tony, anecdotally it seems to me that there is a correlation because temperature and humidity in the formation of pitchers. Where humidity is low, ventricosa does not seem to pitcher freely where nights get much above 18-19 degrees centigrade. However, where the humidity is high, it will continue to produce temps where nights are above 18C, and even up to 20C or more. It also depends on the duration of warm weather, several night in succession of nights at, say, 25C won't stop pitchering if the night temps are generally below 19C for example. It's all a matter of degree.