Compound growing-season climate-event indices for Estonia, 1965–2024

This repository contains the analysis code and derived annual index dataset for a study of compound growing-season climate events in Estonia, 1965–2024. Four indices — hot–dry (CHD5), hot–dry–sunny (CHDS5), cold–wet (CWD3) and wet–humid (WH3) days — were derived from daily observations at 13 Estonian meteorological stations using station- and calendar-month-specific percentile thresholds and antecedent precipitation criteria. The workflow includes data-completeness screening, period comparison (1965–1994 vs. 1995–2024) via Mann–Whitney U tests, trend analysis via Sen's slope with a lag-1-autocorrelation-adjusted Mann–Kendall test, Pettitt's change-point test, and hierarchical clustering of station-level conditions. Raw daily station data (Estonian Environment Agency) are not included due to licensing restrictions and may be requested directly from the agency (https://www.envir.ee). This repository provides the Python analysis script and the derived annual index dataset needed to reproduce the manuscript's tables and statistical results.