Fig. 1: Light rain, wet bulb globe temperature (WBGT) and their relationship during the hottest four months.

a, b, c Global distributions of light rain probability (a), WBGT intensity (b), and temporal correlation coefficients between the two at the monthly scale over 2001–2020 (c). d Global distribution of the intensity of WBGT exceeding the 95th percentile. e Probability of extreme humid heat days and the day before with light rain. f Ratios of the standard deviation of the annual number of light rain days on humid heat wave days and the day before to that of the annual number of humid heat wave days, and the positively correlated areas in time are stippled. Areas exceeding the 95% confidence level of the t test in (c) are stippled.