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  • "In coastal areas or warmer regions, the second condition (6 consecutive days < 5 °C) may never occur in some years, so GSL cannot be calculated and remains NaN." Why NaN? Why not say that if there are no instances of 6 consecutive cold days, then the growing season ends on Dec 31st? That would lead to a very long GSL, but that is maybe reasonable if it is a region with very warm and stable temperatures. Commented Sep 16, 2025 at 15:57
  • There are many techniques for handling missing data in time series... growth-onomics.com/… Commented Sep 16, 2025 at 19:29
  • You are right. It may be possible to fill in the missing years using statistical methods (e.g., imputation techniques). However, selecting an appropriate method for a climate index such as GSL is somewhat difficult, because this is not just a numerical gap, but a deficiency arising from the definition. Commented Sep 17, 2025 at 18:04