. Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean . er is experienced. The direction of the winds, and thetemperatures for the different months of the year will be found in the following table, extractedfrom the meteorological register kept at Fort Months. Monthlymean. 1852. May June. July August . September October November December 1853. January February March April May June. July August September October November o 66 93. 5673. 0961. 60.
. Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean . er is experienced. The direction of the winds, and thetemperatures for the different months of the year will be found in the following table, extractedfrom the meteorological register kept at Fort Months. Monthlymean. 1852. May June. July August . September October November December 1853. January February March April May June. July August September October November o 66 93. 5673. 0961. 60. 1289. 04 94. Highest. Lowest. o108106108108106989075 807892989911611111011010086 o5268707060503832 3736405252617676696045 Winds. W. & & & & & & & NW. N. & NW NW WNW. & & S. & SE S. & SW N. & NW NE. & NW-. Rain. Inches. . . 10 .25 04 . 18 1 This register has been carefully kept by Dr. Milhau, TJ. S. A., who kindly furnished me with the above CLIMATE PURITY OF THE AIR MIRAGE. 251 The remarkably high range of the thermometer, exhibited by this table, cannot fail to benoticed. It is very common to find it standing at 110° during the day, but after the sundescends the temperature rapidly decreases, and the nights are refreshingly cool. The meantemperatures of the seasons, deduced from the observations of the last five years, are asfollows: Spring, ; Summer, ; Autumn, ; Winter, The mean annualtemperature being The sudden diminution of temperature at night is facilitated bythe absence of clouds, or watery vapors, in the air, which allows free and rapid radiation ofheat from the surface, and permits the suns rays to penetrate with remarkable heating powerand chemical effect during the day. The nights and mornings, during our stay upon the Desert,and at Camp Yuma, were always cool and comfortable, and sometim
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