Before and after Qingming, plant melons and beans. What does this proverb mean?

Before and after Tomb-Sweeping Day, the temperature is conducive to seed germination, the temperature will gradually increase, and there will be more and more rainfall. At this time, sowing is also beneficial to the growth of melon beans, because melon beans generally prefer warmth and water. If sowing is late, the temperature is too high and too hot, which is not conducive to their growth.