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Bundahishn 25:25:
The 'vehizaki’ month Farwardin, the month Ardwahisht, and Hordad compose the season of Spring.
The month Tir, the month Amordad, and the month Shahrewar are of Summer.
The month Mehr, the month Aban, and the month Adar are of Autumn;
and the month Day, the month Vohuman, and the month Spandarmad are of Winter.