Warm spell events for the Hellinikon weather station (GR000016716) for the years 1961-2021 using the CTX90pct climate index. Percentile values were computed using the years 1961-1990 as the base period. Results include only summer months (June to August). Source of raw maximum temperature (Tmax) data: [NOAA Global Historical Climatology Network daily (GHCNd)](https://www.ncei.noaa.gov/products/land-based-station/global-historical-climatology-network-daily). Missing dates in the original data result to no warm spell detection. The csv file includes 6 columns. The first 2 columns correspond to the first and the last day of the warm spell event (dd/mm/yyyy). The third column gives the duration of the warm spell in days. Columns 4 to 6 give the average, the standard deviation and the maximum value of Tmax (in degrees Celsius) during the warm spell.