why new york located in the northern hemisphere and the southren hemisphere have opposite seasons?

Answer 1

The seasons are determined by the tilt of the Earth. The Earth's rotation goes about an axis with the ends at the poles. But that axis isn't parallel to the Earth's orbit. It's slanted by about 20 degrees. In the months of June, July and August, the North Pole is tilted toward the Sun. That means that the Northern Hemisphere gets more sunlight more directly, which makes it have longer days and higher temperatures. In December, January and February, the North Pole tilts away from the Sun, meaning it gets relatively little sunlight and that is less intense. So it has short days and low temperatures. The South Pole points in the opposite direction from the North, so the Southern Hemisphere has opposite seasons.

What New York has to do with any of this I don't know.

Answer 2

The seasons result from the Earth's axis being tilted to its orbital plane; it deviates by an angle of approximately 23.5 degrees of arc. Thus, at any given time during the summer or winter, one part of the planet is more directly exposed to the rays of the Sun (see Fig. 1). This exposure alternates as the Earth revolves in its orbit. At any given time, regardless of season, the northern and southern hemispheres experience opposite seasons ..

check:

http://en.wikipedia.org/wiki/Effect_of_sun_angle_on_climate

http://en.wikipedia.org/wiki/Seasons