The polar vortex is a low-pressure system of cold air that swirls above Earth’s poles. There’s one over the South Pole in ...

Cold air from the arctic sometimes dips southward across the American plains. What to know about the polar vortex.

One reason is that global temperatures were off-the-charts hot in 2023, with an average 1.45 °C of warming above the ...

Earth is now closer to the sun than at any other time of the year. Here's why our planet's axial tilt, not proximity to the ...

When one of the poles points more toward the Sun than the other pole, that half of the planet gets more sunlight than the other half, and it’s summer in that hemisphere. When that pole tilts away from ...