The data analysis protocol and scripts are supporting documents to repeat the analysis of the effects of heat exposure during pregnancy on perinatal health for any other country, following the same harmonised procedures as in "Bao M, Nobile F, Koureas M, Bottini I, Fomenko E, Brimicombe C, Tirado V, Mouchtouri V, Hadjichristodoulou C, Ljungman P, Chersich M, Jackson D, Luchters S, Stephansson O, Stafoggia M, de Bont J. Trimester-specific exposure to multiple heat indicators and adverse birth outcomes across four European countries. Environmental Research, Volume 96, 2026. https://doi.org/10.1016/j.envres.2026.124092".