Yes you can plan your jaipur visit in feb end or start of march. Day time will be hot and sunny but ofcourse bearable. Post mid march the temprature will increase and make the situation a bit difficult in terms of bearing the heat in the day.
Absolutely. Infact this is the best time to visit or else you'll have to wait till monsoons and winters. The temp is already rising though bearable with cool breeze perfect for exploring forts. P.S. You can checkout detailed itineraries on my page!!