If someone asks “what month is spring?”, the simplest answer is: in the Northern Hemisphere, or September, October, November in the Southern Hemisphere.

| Season | Astronomical Months | Meteorological Months | |--------|--------------------|-----------------------| | Spring | March 20 – June 20 | March, April, May | | Summer | June 21 – Sept 22 | June, July, August | | Fall (Autumn) | Sept 23 – Dec 20 | September, October, November | | Winter | Dec 21 – March 19 | December, January, February |

Utility companies predict heating and cooling demands based on the meteorological transition from August to September. Summary Table: Seasons by Month (Meteorological) Northern Hemisphere Months Southern Hemisphere Months Spring March, April, May Sept, Oct, Nov Summer June, July, August Dec, Jan, Feb Fall Sept, Oct, Nov March, April, May Winter Dec, Jan, Feb June, July, August

The seasons are reversed relative to the Northern Hemisphere.

Below is the breakdown for each hemisphere and system.

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