In 1999—2006(6~8 years), appearance quality of rice grains, namely percentages of whole, immature, damaged, colored and opaque grain, and whiteness of brown, milled rice were examined in 15 areas of Hokkaido. The range of the yearly variation in those appearance qualities was 1.5-6.4 times respectively, larger than that of regional variation. That was because the range of the yearly variation in the mean temperature during of some growth stages such as both the temperature during the sensitive stage to stelile-type cool injury (TSSC) and the cumulative daily mean temperature during 40 days after heading (CTAH) and in growth characteristics like grain yield and protein content (PC) was 3.0-3.7, 1.4-3.3 times, larger than that of regional variation. Among years, the lower the sterility, the heavier the 1000-kernel-weight; the higher was the percentage of whole grain. Higher the percentage of whole grain, the higher the grain yield; the lower was the PC. The higher the TSSC, lower the sterility, the lower the PC; the higher the CTSH, the higher the whiteness of brown rice, the higher was the whiteness of milled rice. Moreover between the percentages of both damaged and colored grains a positive correlation was found, and the higher the CTAH to 890, 850 ℃ respectively, those percentages were the lower. At 808 ℃of the cumulative daily mean temperature during CTAH, the percentage of immature grains were lowest in the quadratic regression relationship, and the latter half of CTAH affected greater on percentage of immature grain than the first half of it. Poor sunshine increased number of immature grains, too. The regional variation of appearance quality of rice grains did not correlate with these growth characteristics, but the lower the ratio of peat soil in the paddy field, the higher the ratio of gray lowland siol, the lower was the percentage of opaque grains. At the present cultivation techniqures that improve those appearance quality of rice grains have been developed and have disseminated to farmers.