That may depend on the country. I'm guessing here, but I think in Norway, where the study took place, spring-to-summer might generally be more comfortable to be outside in than winter. To put it another way, their winter would be cold enough to provoke cold intolerance more often than their spring-summer would be hot enough to provoke heat intolerance.
Rekeland et al. write:
What do Norwegian members think?
@Midnattsol @Utsikt I think you might be from Norway. Would you expect Norwegian pwME's steps to be higher in winter or summer?