I think that you will find that the "goldilocks zone" is a whole lot bigger than a mere 142 kilometres wide.
Winter in the Northern Hemisphere occurs when the Axial Tilt causes the Nortern Hemisphere to be FURTHEST from the Sun and vice versa in the Southern Hemisphere btw.

@Triphid I think @PossiblyNuts is referring to the distance of the whole planet from the sun, which is greater during the northern summer (for the next few thousand years, at least). You're right about the size of the Goldilocks zone, though: 142 kilometres would fall a long way short of even including the whole Earth.

@Coffeo If it were just the AU distance that caused the season then both hemispheres would have exactly the same season at exactly the same times of year, would they not?
The Axial tilt, according to Scientists, etc, causes the two hemispheres to alternate in the their proximity to the Sun as Earth orbits it thus determining which hemisphere is in Winter and which is in Summer.
Plus IF, as @PossilblyNuts stated, the Goldilocks Zone was a mere 142 kilometres wide then given the diameter of the Earth at the Equator, logically, then only ONLY a band of 142 kilometres of the planet would be within the Goldilocks Zone and habitable for life would it not?
Plus, given that Earth rotates upon its axis one complete rotation in approx. every 24 hours that 'habitable' band would be constantly shift around the surface of the planet.

@Triphid Pretty much what I said, I thought.