The weather varies markedly according to elevation, and lack of precipitation, along with infertile soil, makes land at elevations higher than 400 meters unsuitable for purposes other than grazing. Precipitation is geographically and seasonally irregular, and in most parts of the country as much as half the annual rainfall occurs in the three summer months. This pattern favors the cultivation of paddy rice in warmer regions that are outfitted with irrigation and flood control networks. Rice yields are 5.3 tonnes per hectare, close to international norms. In 2005, North Korea was ranked by the FAO as an estimated 10th in the production of fresh fruit and as an estimated 19th in the production of apples.