In the Northern Hemisphere, spring is most commonly defined by the astronomical calendar. It begins with the vernal equinox, which usually falls on March 20th or 21st. Under this system, spring spans from late March through April and May, officially ending with the summer solstice in June. This transition is marked by the moment the sun crosses the celestial equator, resulting in nearly equal day and night.

In the Northern Hemisphere, meteorological spring lasts exactly three months: Winter transitions to early spring conditions.

The months of spring depend on the system used. Meteorologically, spring consists of March, April, and May (in the north). Astronomically, it runs from the March equinox to the June solstice. For the vast majority of school and general weather discussions, March, April, and May are considered the standard spring months in the Northern Hemisphere.

Not every region uses a traditional four-season model. Climate variations dictate unique seasonal calendars in specific geographic zones. South Asia and India

Meteorological seasons align directly with the civil calendar. This system groups months by temperature patterns and decimal groupings. It simplifies climate data tracking across the globe. Northern Hemisphere

Temperatures rise mid-season alongside frequent rainfall. May: Warm conditions stabilize ahead of summer. Southern Hemisphere

Geography plays the most significant role in determining which months are considered spring. For those in the Southern Hemisphere, the seasons are reversed. When the north enters autumn, the south begins its spring. In countries like Australia, South Africa, and Brazil, spring occurs during the months of September, October, and November.