"When conducting prayers for rain, if rain actually falls, the nature and aspect of the rain will indicate whether the person conducting the prayers is worthy or unworthy. There are various types of rain such as heavenly rain, dragon rain, asura rain, coarse rain, sweet rain, and thunder rain.
In the present instance of prayers for rain, of course, no rain whatsoever fell. Moreover, for a period of fourteen days there was even more severe drought than there had been previously, and great evil winds blew without cease throughout the twenty-four hours of the day and night." -- Nichiren