The equator stays warm all year because it receives the most direct sunlight.

The longer version

Near the equator the sun passes almost directly overhead, so its rays arrive at the steepest possible angle and deliver the greatest concentration of energy. That geometry changes very little across the year, which is why the region has no strong seasonal temperature cycle at all.

The intense heating drives air to rise continuously, producing frequent cloud and heavy rain. Many equatorial places therefore have wet and dry periods rather than hot and cold ones, and winds carry some of that warmth upward and outward toward higher latitudes, where the heat is eventually lost to space.

Where this entry sits

Clouds, wind, rain, and storms shape daily life in ways that most people barely notice. This collection explains snow, lightning, rainbows, the turning seasons, temperature, the instruments forecasters rely on, and scraps of old weather lore. The full list sits on the Weather and Climate page, where every entry is listed in order.