SummarySummertime weather stress indices for Phoenix, Arizona are analysed for the period 1948 to 1984. Weather stress levels for the nighttime period are increasing rapidly over the past several decades. These increasing discomfort levels are a result of a sharp increase in nocturnal temperatures. A small, but statistically significant, dechne in atmospheric moisture levels is moderating the upward trend in weather stress. Changes in local landuse patterns are apparently responsible for the general trends found in the temperature, atmospheric moisture, and weather stress indices.
Zusammenfassung Zeitanalyse yon sommedichen Wetterstrefiniveaus in Phoenix, ArizonaEs werden Indizes des sommeflichen Wetterstrei~ fiir den Zeitraum 1948 bis 1984 analysiert. Die n~ichtlichen Komfortwerte haben sich in den vergangenen Jahrzehnten rasch verschlechtert, verursacht yon einer deutlichen Erh6hung der Nachttemperaturen. Eine geringe, aber statistisch signifikante Verringerung der Luftfeuchtigkeit verlangsamt den Aufw~rtstrend des Wetterstre$. Ftir diese Entwicklungen der Temperatur, Feuchte und Behaglichkeitsindizes sind offenbar die Vefiinderungen der lokalen Landnutzung verantwortlich.
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