INFORMATION regarding the precise climatic conditions that exist in mountainous desert areas is meager. Major transportation routes normally pass from basin to basin, and in a few desert basins meteorological records have been kept for a long time. But desert mountains are singularly uninhabited; any occupance is likely to be only the ephemeral stay of the miner or the migratory wandering of the herdsman, neither of which is conducive to the keeping of weather records. Several years ago the writer undertook a study of the detailed distribution of climatic features within a representative area of the southwestern deserts of the United States.' In the course of that study simultaneous coordinated observations of temperature were obtained at contrasting locations in and about a typical mountain range, and the present paper makes use of these observations in an endeavor to present an over-all picture of the winter thermal conditions.2 The area investigated lies in the eastern part of the Mojave Desert. It is in San Bernardino County, California, northwest of Essex and north of Amboy, desert stations on the Atchison, Topeka and Santa Fe Railway and U. S. Highway 66, and east of Kelso, a division point on the Union Pacific Railroad (Fig. 1). Physiographically, it lies in the Basin and Range province
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