태조‧정종‧태종 재위 기간에는 대략적으로 보아서, 가뭄이 없었던 해, 초봄 가뭄이 심했던 해, 늦 가뭄이 심했던 해가 비슷한 비율로 나타난다.
In the period of taejo‧jeongjong‧taejong re-ranking period, a similar rate is seen in the year when there was no drought, the year when the early spring drought was severe, and the year when the drought was severe in late years.