Just the definition of what a boreal forest is, if it would be warmer and have a longer growth period, it would not be in the boreal zone.Over 10°C seems like acceptable temperatures for some growth, but < 100 days per year is clearly a low amount.
Ah, I thought it was just measured by the ambient temperature all over the year, good to know.If it would be warmer and have a longer growth period, it would not be in the boreal zone.