When is it warm in spring and sunny in bloom?

March in lunar calendar and April in solar calendar.

It usually blooms in March, as the saying goes, it's spring in March and spring in bloom, because after a period of time in beginning of spring, the temperature rises slowly. Generally, in March, when the temperature reaches twenty-four or five degrees, all the flowers have already bloomed, so it's a good time to enjoy flowers, so it's usually in March, so you can go out for an outing.