Seasonal Period Calculator

Free seasonal period calculator. Find which season any date falls in—spring, summer, fall, winter. Support for both hemispheres.

Determine which season any date falls in. See whether a date is in spring, summer, fall, or winter, with correct handling for both Northern and Southern hemispheres.

Common use cases

  • Seasonal planning and scheduling
  • Travel season awareness
  • Agricultural planning
  • Retail and business seasonality
  • Educational purposes

How to use

  1. Enter any date
  2. Select your hemisphere
  3. View the season for that date
  4. See season start and end dates
  5. Check meteorological vs astronomical seasons

FAQ

What's the difference between hemispheres?

Seasons are reversed: when it's summer in the North, it's winter in the South.

Astronomical vs meteorological seasons?

Astronomical uses solstices/equinoxes; meteorological uses fixed month groupings (Dec-Feb = winter in N).

When do seasons start?

Astronomical seasons start at solstices/equinoxes (~21st of March, June, September, December).