In Toronto, the day of the spring equinox is 3 minutes longer than the previous day in Miami, roughly 2000 kilometers or 1200 miles farther south, the difference is only about 1 minute and 31 seconds. On the longest day of the year, the summer solstice, the day-to-day difference reaches zero.Īt the same time, locations farther from the equator experience larger day-to-day differences. After that, days still get longer, but at an ever-decreasing rate. In fact, the increase is greatest in the days surrounding the spring equinox. Meteorological and other seasons definitions Greatest Increase in Day LengthĪs spring starts, the length of day increases dramatically in most regions-except for the tropics, where day lengths do not change much during the course of a year. Also, some countries don't have fixed season dates but determine the start and end of spring based on average temperatures. In meteorology, the spring season begins on a different date.
Spring Equinox, Southern Hemisphere (September)Īustralia, New Zealand, South America, southern Africa Business Date to Date (exclude holidays).
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