Today is the Vernal Equinox, the first day of Spring in the Northern Hemisphere. At the Vernal Equinox, the Earth is at a 90 degree angle to the sun in its orbit. This gives everyone on Earth around 12 hours of daylight and 12 hours of darkness. ("Equinox" is Latin for "Equal Night"). Sunrise on March 20 at Indianapolis is 7:49 AM EDT and sunset is 7:57 PM EDT.
As the seasons change on this date, weather can range from snow and cold to summer-like conditions. Below is a graph showing the averages and extremes for the Vernal Equinox at Indianapolis. Although it will feel like Spring tomorrow with highs in the 60s, winter will return for early next week with several days with highs in the 30s.