If you’ve ever heard of the vernal equinox , you’re already familiar with astronomical seasons. This system defines spring based on Earth’s position relative to the Sun.

Let’s break it down.

| System | Northern Hemisphere | Number of Months | |--------|--------------------|------------------| | Calendar (popular) | March, April, May | 3 | | Meteorological | March 1 – May 31 | 3 | | Astronomical | Late March to late June | ~3 (overlaps 4 months) | | Ecological / Cultural | Varies by location | 2 to 4 |