First Day Of Winter 2024 Usa Time. The first day of winter (winter solstice or december solstice) is when the sun is in its most southern. Summer begins with the summer solstice, thursday, june 20, 2024, 4:51 p.m.
Spring begins with the vernal equinox, tuesday, march 19, 2024, 11:06 p.m. In december, the winter solstice marks the exact moment the northern hemisphere is tilted the furthest away from the sun.
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