The relationship between atmospheric precipitation, cosmic radiation and solar activity during the change of dry and wet periods in the Crimea was investigated on the basis of long-term observation data. It was found that on an interannual time scale, dry periods correspond to periods of increase in high-energy cosmic radiation and decrease in solar activity. In contrast, wet periods correspond to periods of decreasing cosmic radiation and increasing solar activity (Wolf number). Heavy showers and floods, especially in the zenithal period of the year in June-July, are usually timed to extremes of cosmic radiation and variations of solar activity on a “days-months” scale, which occur due to increased solar flare activity.