Ritus or seasons according to Hindu Almanac

According to the Hindu claendar there are six Ritus or seasons.

1. Vasanta Ritu (Spring season) - March-May
   
2. Greeshma Ritu (Summer season) - May-July
   
3. Varsha Ritu (Rainy season) - July - September
   
4. Sharad Ritu (Autumn season) - September - November
   
5. Hemanta Ritu (Winter season) - November - January
   
6. Shishir Ritu (Cool season) - January - March

(source: Pg 11, Fasts and Festivals of India by Manish Verma, Diamond Pocket books)