Abstract
In this paper, we empirically investigate whether the climate-migration relationship exhibits thresholds. We employ a threshold regression model and a large data set of international migration flows to investigate the existence of thresholds in the climate-migration relationship, while allowing for time-variability in the thresholds. We find evidence for one threshold in the temperature-migration relationship. The average temperature threshold in our sample is found to be 21.78 degrees C (71.2 degrees F) which is supported by results in other parts of the climate-society literature. However, we find that the threshold varies around a constant mean. Finally, our results show that, at the threshold, the effects of the other control variables, such as income and migration costs, change sizably.