Abstract
SYNOPSIS In 1913 an investigation was begun to determine within what limits the foothill sections of the Salt River Valley in the vicinity of Phoenix were adapted to citrus culture. Later the scope of the investigation was broadened to include a study of winter temperatures over the whole valley. Upon the basis of records kept at more than 40 stations in the area considered a temperature map was drawn showing the mean minimum temperatures for December and January; the average length of the growing season in the different sections of the valley was determined; a basis was established for forecasting minimum temperatures in the various sections as related to the temperatures expected at the Weather Bureau station in Phoenix; in short, data on winter minimum temperature conditions throughout the valley were gathered and put into such shape as to be useful not only to the citrus grower but to all ranchers, to A intending land buyers, to men looking for the best location for any particular crop and, as it developed, to health seekers searching for the best vantage ground from which to make their fight against tuberculosis. Work during the winter of 1919–20 was directed almost exclusively to the study of temperature inversion as found over the valley, a cross section from the hills on the north down across the Salt River and up into the hills on the south affording an excellent opportunity for such a study.

This publication has 0 references indexed in Scilit: