I believe they "fatten up" in the autumn to make sure that they have the fat reserves to see them through the winter.
late autumn
They weigh more in late autumn. They hibernate, so they build extra fat in autumn to prepare themselves for the winter. In spring they will have lost weight because of having hibernated.
The weather in Cancun can be very hot but wet in the late Autumn into early Winter so September would be the best time of Autumn to visit when you are more likely to miss the rain.
yes. If they are late hatching they may be late molting
late summer to fall/autumn
late autumn/winter
Late Autumn 2010
Hurricanes are most likely to occur in late summer.
This is a low lying place where late and early frosts are more likely than in the surrounding areas. A frost pocket is sometimes sparse in vegetation, especially in those species that can be damaged by late frosts in spring or early frosts in autumn.
Late Autumn (Fall)/Early Winter
Second half of August, through to the beginning of Autumn.
In the UK, late autumn or early winter