Daily Forecast for Keene, New Hampshire

Meteorologists welcome spring on March 1, but astronomical spring comes later

Published on Feb. 28, 2026

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The first of March marks the start of spring for meteorologists in the Northern Hemisphere, even though astronomical spring comes much later in the month on the spring equinox. Meteorologist Caitlin Kaiser explains the differences between the two and why meteorologists follow a different seasonal calendar.

Why it matters

The distinction between meteorological and astronomical spring is important for weather forecasting and reporting, as it allows meteorologists to align their seasonal calendars with typical weather patterns rather than the astronomical calendar.

The details

Meteorologists define spring as the three-month period from March 1 to May 31, while astronomical spring is determined by the position of the Earth in relation to the sun and occurs on the spring equinox, which typically falls around March 20-21. This difference allows meteorologists to more accurately track and report on seasonal weather trends.

  • Meteorological spring begins on March 1 each year.
  • Astronomical spring occurs on the spring equinox, typically around March 20-21.

The players

Caitlin Kaiser

A meteorologist who explains the differences between meteorological and astronomical spring.

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What they’re saying

“As we flip the calendar to the first of March, meteorologists in the Northern Hemisphere are welcoming spring with open arms.”

— Caitlin Kaiser, Meteorologist (weather.com)

The takeaway

The distinction between meteorological and astronomical spring allows weather forecasters to better align their seasonal calendars with typical weather patterns, leading to more accurate reporting and predictions.