The work done at a climatological section center of the Weather Bureau furnishes good evidence of the many and varied applications of climatology. These are not known to the general public, and even professional meteorologists have but a limited appreciation of their extent and variety. The practical applications of climatology in California are here briefly enumerated and described in the hope that the survey may be of interest. and perhaps of value in other climatological sections, and with a desire that it may inspire similar surveys of other regions. In California the Weather Bureau acts as a meteorological and climatological center of information and clearing house, and supervises the gathering and publication of a small fraction of the data available. Municipalities, industries, public service corporations, business houses, resorts and institutions maintain climatological stations and secure data which are of great practical value in agriculture, manufacture, industry, mining, transportation. aviation, conservation, public service, advertising, public health and recreation.