Bean plants flourishing in colder weather

During November, early December 2015, the weather in Goa was fairly warm, due to which no plants or seeds were growing despite watering them regularly. Now in end december 2015, the morning temperature has declined to a great extent, and the bean plants are again sprouting well.
It appears that the bean plants are the easiest plants to grow at home, no special care has to be taken and they grow rather fast. It is also simple to procure the bean seeds from any grocery shop unlike some other seeds like cucumber, water melon and brinjal seeds