Find which season any date falls in, for the Northern or Southern Hemisphere.
Enter any date, choose a hemisphere, and this tool tells you which season that date falls in — spring, summer, autumn or winter — using either the simple meteorological definition (fixed calendar-month boundaries) or the astronomical definition (based on the actual solstice and equinox dates for that year).
Meteorologists split the year into four equal three-month blocks purely for consistency in climate record-keeping: December-January-February is winter in the Northern Hemisphere, and so on, always starting on the 1st of the month. Astronomers instead tie each season's start to the exact solstice or equinox — the point where the sun's position relative to Earth changes in a specific way — which shifts by a day or two each year and doesn't align neatly with calendar month boundaries. Both are 'correct'; they're just built for different purposes.
The Northern and Southern Hemispheres experience opposite seasons at the same calendar time, because they're tilted toward or away from the sun in opposite directions throughout Earth's orbit. December falls in winter for New York but in summer for Sydney. This tool lets you pick the hemisphere so the season returned actually matches the reality of wherever you're asking about.
For the astronomical mode, this tool uses the approximate average dates of the solstices and equinoxes (which drift only slightly year to year — typically within a day of March 20th, June 21st, September 22nd and December 21st) to determine which quarter of the year your date falls into, then maps that quarter to the correct season for your selected hemisphere.
Meteorological seasons are simpler and used for climate statistics and general everyday reference; astronomical seasons are more precise and tied to Earth's actual orbital position, and are more common in almanacs and cultural or religious calendars.
Because meteorological seasons always start on the 1st of a month, while astronomical seasons start on the solstice or equinox date itself, which usually falls a few weeks later — so a date in early March might be 'spring' by the meteorological definition but still 'winter' by the astronomical one.
No, it can shift by a day or two from year to year due to the mismatch between the calendar year and Earth's actual orbital period, though it stays within a very narrow window around the same few calendar dates.
This tool applies the standard hemisphere-based definitions regardless of latitude; regions near the equator may not experience the same dramatic seasonal temperature shifts implied by these labels, even though the calculation still returns a technical season name.
Yes, both the meteorological and astronomical calculations work for any year, since they're based on fixed calendar rules or well-established average solstice/equinox timing.