Rajasthan
October to March is the most comfortable. Summers are very hot.
Kerala
Roughly September to March, after the monsoon, for pleasant weather.
Himachal Pradesh
Spring and early summer for mountains, autumn for clear skies, winter for snow.
Ladakh
Roads and passes are generally open from early summer to early autumn.
Goa
November to February for dry, sunny beach weather.
Andaman Islands
Roughly October to May for calm seas and good visibility.