The document discusses the winter season. Winter starts on December 21st and ends on March 21st. During winter, the nights are longer than the days and it is cold enough to snow in higher areas. Some celebrations that occur in winter include Christmas, New Year's, Carnival, and Three Kings Day. To stay warm during winter, people light fireplaces and use heating systems. Winter precipitation can occur as rain when temperatures are above 0°C, snow when temperatures are below 0°C, hail which is frozen water, or watersnow which is snow with a lot of water content.