A cloudy day occurs when the sky is covered with clouds, blocking sunlight from reaching the ground. These clouds can vary in type and thickness, leading to different weather conditions. On cloudy days, temperatures may feel cooler, and the likelihood of precipitation, such as rain or snow, can increase. Clouds are formed when water vapor in the air condenses into tiny droplets or ice crystals. This process can create various cloud types, including cumulus, stratus, and nimbus. A cloudy day can affect mood and outdoor activities, as many people prefer sunny weather for recreation.