Exploring the ecological relationship between temperature and prosocial behaviour: A geographical and temporal analysis

Previous research on the link between temperature and prosociality has produced mixed findings. A recent meta-analysis focusing on laboratory-based research concluded that the effect was null, a conclusion that was subject to low ecological validity. This paper complements the discussion by investigating the link between ambient temperature and three indicators of real-life prosociality in 164 regions over 14 years. The between-regional comparison probes the relationship over a wide range of thermal conditions, whereas the within-regional temporal comparison draws this literature to the real-life problem of global warming. Bayesian analysis indicates that temperature is linked to helping strangers, but not volunteerism or charity donation. Hotter regions have more helping respondents than colder regions, and as a region warms, it also records more helping respondents. The positive link between temperature and helping is in line with social thermoregulation theory, but it is also subject to alternative explanations from a cultural perspective and sociological perspective. We conclude that it is unrealistic to expect temperature to have the same effect on all prosocial acts without considering contextual factors and the underlying mechanisms. Our findings call for a nuanced view concerning the effect of temperature on prosociality, which awaits verification by rigorous research designs.