Climatography of the Salt River Valley region of Arizona, the land of health and sunshine . temperature falls as much by 6 p.m. at Denver,as it does by 8 p.m. in New York and Philadelphia. Thiswould seem to be the result of the greater daily range andmore rapid rate of cooling at elevated stations. West ofthe Rockies the differences range from zero, at Red Bluff,to less than 4° in the great interior basin, and from 5° to6° in Southern Arizona. The local vicissitudes of temperature are well illustratedin the case of Red Bluff, Cal., where the average tempera-ture at about 5 p.m., local time, is

- Image ID: 2AWXR06
Climatography of the Salt River Valley region of Arizona, the land of health and sunshine . temperature falls as much by 6 p.m. at Denver,as it does by 8 p.m. in New York and Philadelphia. Thiswould seem to be the result of the greater daily range andmore rapid rate of cooling at elevated stations. West ofthe Rockies the differences range from zero, at Red Bluff,to less than 4° in the great interior basin, and from 5° to6° in Southern Arizona. The local vicissitudes of temperature are well illustratedin the case of Red Bluff, Cal., where the average tempera-ture at about 5 p.m., local time, is Stock Photo
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https://www.alamy.com/licenses-and-pricing/?v=1 https://www.alamy.com/climatography-of-the-salt-river-valley-region-of-arizona-the-land-of-health-and-sunshine-temperature-falls-as-much-by-6-pm-at-denveras-it-does-by-8-pm-in-new-york-and-philadelphia-thiswould-seem-to-be-the-result-of-the-greater-daily-range-andmore-rapid-rate-of-cooling-at-elevated-stations-west-ofthe-rockies-the-differences-range-from-zero-at-red-bluffto-less-than-4-in-the-great-interior-basin-and-from-5-to6-in-southern-arizona-the-local-vicissitudes-of-temperature-are-well-illustratedin-the-case-of-red-bluff-cal-where-the-average-tempera-ture-at-about-5-pm-local-time-is-image342952182.html
Climatography of the Salt River Valley region of Arizona, the land of health and sunshine . temperature falls as much by 6 p.m. at Denver,as it does by 8 p.m. in New York and Philadelphia. Thiswould seem to be the result of the greater daily range andmore rapid rate of cooling at elevated stations. West ofthe Rockies the differences range from zero, at Red Bluff,to less than 4° in the great interior basin, and from 5° to6° in Southern Arizona. The local vicissitudes of temperature are well illustratedin the case of Red Bluff, Cal., where the average tempera-ture at about 5 p.m., local time, is
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Image ID: 2AWXR06
Climatography of the Salt River Valley region of Arizona, the land of health and sunshine . temperature falls as much by 6 p.m. at Denver,as it does by 8 p.m. in New York and Philadelphia. Thiswould seem to be the result of the greater daily range andmore rapid rate of cooling at elevated stations. West ofthe Rockies the differences range from zero, at Red Bluff,to less than 4° in the great interior basin, and from 5° to6° in Southern Arizona. The local vicissitudes of temperature are well illustratedin the case of Red Bluff, Cal., where the average tempera-ture at about 5 p.m., local time, is but four-tenths of adegree below the maximum of the day. Curiously enough,at Los Angeles, in the lower part of the State, the 5 p.m.temperatures are about 10° lower on the average than themaximum of the day. Chart III has been constructed to show the relativehumidity of the United States in summer. The data usedin preparing the chart were the synchronous observationsat 8 a.m. and 8 p.m., seventy-fifth meridian time, duringthe eight years 1889-96. The chart itself shows better than. 49 mere words the distinctively dry and humid regions. Theinfluence of the ocean is seen on both coasts, as also thatof the Gulf of Mexico and the great lakes. Broadly speaking, the variation of insolation from dayto night, and from season to season, with the changingdeclination of the sun, is the great controlling agent ofclimate. The most regular, and at the same time thesimplest, climate of the world, is that of the Tropics, wherethe succession of changes from day to day are as monoto-nous in their regularity as they are enervating on the humansystem. The great life zone, the seat of business enter-prise and activity, is found in temperate climates. Herethe simple diurnal changes of the Tropics are largelymasked by irregular changes, the result of the passage ofcyclonic and anti-cyclonic systems. The sum total of thesechanges constitutes the weather of the temperate zone. Between the Tropics

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