Where Wind Comes From Wind Origins Wind is defined as the horizontal movement of air relative to the earth's surface. Differences in temperature.
Air temperature varies because the earth's surface heats up at different rates.
Latitude and season cause temperature variations. Large bodies of water warm and cool at a slower rate than large bodies of land, creating a disparity in the atmosphere above. Because heat decreases with altitude, mountain peaks are cooler than cities at sea level. These are a few of the causes of differing temperatures. Differences of temperature cause differences in pressure.