+------------------+--------+-------+---------------------------------+ | | | | Percentage of annual rainfall. | | | | +---------------------------------+ | | Mean |Total |Spring. | | | Groups of |latitude|years | |Summer. |Spring | | stations. | of | of | | |Autumn. | and | | | group. |record.| | | |Winter.|summer.| +------------------+--------+-------+-----+-----+-----+-------+-------+ | | ° ´ | | | | | | | |Eight stations in | | | | | | | | |Dakota, Minnesota,| | | | | | | | | and Nebraska | 45 20 | 67 | 29 | 43 | 19 | 9 | 72 | |Three stations | | | | | | | | | in Kansas | 38 45 | 38 | 24 | 41 | 24 | 11 | 65 | |Eight stations | | | | | | | | | in Texas | 29 45 | 85 | 19 | 36 | 31 | 14 | 55 | +------------------+--------+-------+-----+-----+-----+-------+-------+ A moment’s inspection will show that the middle group is intermediate between the northern and southern in all its characters. The spring quota of rainfall progressively diminishes from north to south, and so does the summer, while the fall and winter quotas increase. What is lost in summer is gained in winter, and thereby the inequality of rainfall from season to season is diminished, so that a rainy season is not so well defined in Texas as in Dakota. What is lost in spring is gained in autumn, and thereby the place of the rainy season in the year is shifted. In Dakota the maximum of rain is earlier than in Texas, and corresponds more nearly with the maximum of temperature. TABLE VIII.--_Seasonal precipitation in the San Francisco Region._