How likely is it that polls on happiness, subjective well-being, self-worth, subjective productivity etc. are influenced by the position of the date of the poll relative to school year? (School has dictated my plans for sixteen years, and with my kid enrolled in the kindergarten we enter the same pattern. That's half my life, optimistically speaking.)

I suppose in people whose work is built upon different seasonalities (like seashore resort employees, or long-distance delivery workers, probably?), ratings should differ from the rest of the population.