In the GDD sum, months with negative values are...

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Multiple Choice

In the GDD sum, months with negative values are...

Explanation:
GDD measures heat accumulation above a base temperature and is accumulated day by day, adding only positive contributions. If the daily mean is below the base, that day contributes zero, not a negative amount, so it doesn’t reduce the total. Therefore a month with negative GDD values adds nothing to the annual sum, meaning those months are not counted toward the GDD total.

GDD measures heat accumulation above a base temperature and is accumulated day by day, adding only positive contributions. If the daily mean is below the base, that day contributes zero, not a negative amount, so it doesn’t reduce the total. Therefore a month with negative GDD values adds nothing to the annual sum, meaning those months are not counted toward the GDD total.

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