Why is fog more common in winter months?

Fog is more common in the winter months primarily due to longer nights allowing for increased cooling. During winter, the nights are longer, which means that the air has more time to cool down after sunset. As the temperature drops, the air can reach its dew point more easily, resulting in condensation as humid air cools. This condensation manifests as fog when the air is saturated, particularly under conditions of relatively high humidity.

In contrast, shorter nights, lower humidity levels in some regions, and stronger winds typically do not contribute to fog formation in the same way. While winter months may also bring varying humidity levels and wind speeds, the key factor remains the cooling effect associated with longer nights, which enhances the likelihood for fog development.