They go about their daily business.
Mexico is in the Northern Hemisphere so when it is winter in the U.S. it is also winter in Mexico.
Paris, of course. Mexico has a large range of temperatures, but only few places in Mexico receive winter snowfalls, as Paris usually does.
once every winter
winter, to Mexico
no
Summer: Mexico City, Mexico Winter: Grenoble, France
it is so cold
mexico
they migrate to mexico for the winter
mexico
Winter. Yeah, Mexico is still in the Northern Hemisphere. The half of the world above the Equator. You have to go below that line before the seasons switch.
how do butterflies survie in the winter?