Let's take the month of September. For the past five years, the weather conditions in September have been very favourable and frost-free, whereas, previously, by September 20 or so, we might have had to deal with one or two radiation frosts in order keep production going into October. The more frosts there are, the more the plant slows down and moves towards dormancy. If we have periods, then, that are not cold below four degrees Celsius, the plant is able to continue intensive production for as long as it is not forced into dormancy. We harvest perennial plants. The strawberry, the raspberry, and the blackberry are perennial plants.
On February 5th, 2018. See this statement in context.