Arizona republican., 1918-06-21


 strument is way up on top of a build ing In the first place the four ther- mometers are NOT on top of a tall building and in the second place. if they were. it would make less than one degrees difference.
 Warmest on Record, 117 Degrees
 The warmest day ever recorded in Phoenix was July 3. 1907 when the gov ernment recorded a temperature of IF above. The nearest approach to that day was June 24. 1902, when 116 de- grees was the record.
 Always with such high temperature there is next to no humidity. The real ly hot days are those when only 102 or 1O4 is recorded and the humidity ranges about 40 per cent Then it is hot. In the middle west 100 above with - per cent humidity is warmer to humans than it ever gets in the Salt River valley.
 The hottest day so far in 1918 was IA degrees above, which was two de- grees hotter than any day in 1917. In 1917 there ware 992 days which were clear and only 2S cloudy ones.
 June First Hot Month In degrees June averages some of the
 
 midity is averaging low. In August the humidity is higher so that month seems the hottest of the summer Besides, it is at the end rather than the begin ming of the heated term. From killing | frost to killing frost in 1917 was 279 | days, giving probably the longest growing season of any agricultural val 1 ley in the world.
 | High Summer Temperatures Over the more humid portions of our country, such as the states east of the | Rocky mountains and the coastal re- | gions of the Pacific bodily discomfort | is felt, as rule. whenever the highest | temperature for the day amounts to l about S5 degrees. the heat becomes op- | pressive at ninety, and the discomfort | increases with each additional degree until a day with 100 degrees seems | almost uncomfortable Without some understanding of the atmospheric con- ! ditions prevailing over the lower alti- tudes of the interior Southwest that modify the effect of high temperatur, upon animal life, a resident of these more humid regions would be appalled, by an examination of our records O. maximum temperatures. He would find that at Phoenix temperature! above 90 degrees have occurred in al but two months of the year; that sucl temperatures are of common occur. renee in April, May. September anC | october. that for the three summer months temperatures of 100 degrees, O. lahove. are the rule. and that few year. pass without an extreme of from It to 11j degrees. Without such under standing, it would be difficult to con vince such a person that residents her are ordinarily very comfortable indeed at a temperature of 100 degrees ant that in respect 10 bodily discomfort 1 no degrees here is less oppressive thai 90 degrees where the air is damper.
 Oppressive at 100 Degrees
 On the few really oppressive day that occur here. the temperature sel dom exceeds 100 degrees. These day come with the formation of clouds an, the occasional setting in of unsettle, and showery weather in the months o July and August.
 During the summer months the tenn perature normally reaches from 100 t 102 degrees in the heat of the after noon. but that there is a wide rang , between the day and the night and tha the average of the lowest temperature compares very favorably with the rec ords from many sections whose day time temperatures average from 15 t. IS degrees below those of Phoenix. Il june this daily range amounts to nearl, g degrees. and in July it is more thal 26 degrees. This difference between the day and the night Temperature i about twice as great as that of man eastern cities, and. when compare with some. the excess is even nor decided The dry air and the clea skies of Arizona favor the rapid radia ton of heat after sunset. For thi reason the lower strata of the atmos phere cool rapidly after darkness set in and a sultry night is of rare oc currence.
 ] Relative humidity is the importan factor in the effect of high tempera