Northern Hemisphere Season ⇒

To simplify climate statistics and forecasting, meteorologists and climatologists define seasons based on the annual temperature cycle, not the Sun’s position.

The polar jet stream shifts equatorward in winter (bringing cold Arctic air south) and poleward in summer. Its position dictates storm tracks and temperature boundaries. northern hemisphere season

This system aligns with the lag in surface heating: the warmest three months (June–August) correspond to summer, even though the maximum solar input occurs at the June solstice. To simplify climate statistics and forecasting