• Arizona Statewide Rainfall

      Green, Christine R.; Institute of Atmospheric Physics, The University of Arizona (Institute of Atmospheric Physics, University of Arizona (Tucson, AZ), 1959-11-30)
      A statistical method of deriving a statewide average annual preciptation value for Arizona has been developed in this study. The techniques employed and several examples showing how these calculations may be used to determine any given year's average rainfall amount for the state or for any smaller state subdivision are presented.
    • Fourier Analysis of the Annual March of Precipitation in Australia

      Bryson, Reid A.; Institute of Atmospheric Physics, The University of Arizona (Institute of Atmospheric Physics, University of Arizona (Tucson, AZ), 1957-05-31)
      Monthly standard normal rainfall data for about 200 Australian stations was subjected to Fourier analysis. Charts were then plotted for phase angle and amplitude of each of the first four harmonics. These provide an objective description of the pattern of annual march of rainfall, and clearly delineate certain rainfall regions and climatic divides.
    • Seasonal Precipitation and Temperature Data for Selected Arizona Stations

      Green, Christine R.; Institute of Atmospheric Physics, The University of Arizona (Institute of Atmospheric Physics, University of Arizona (Tucson, AZ), 1964-07-15)
      Annual tabulations of winter (November through April) and summer (May through October) precipitation and temperature for 23 Arizona weather stations have been analyzed in this report. Their relationships are shown and discussed briefly.
    • The Annual March of Precipitation in Arizona, New Mexico, and Northwestern Mexico

      Bryson, Reid A.; Institute of Atmospheric Physics, The University of Arizona (Institute of Atmospheric Physics, University of Arizona (Tucson, AZ), 1957-06-07)
      This report is concerned with the annual march of monthly precipitation amount in an area comprising the states of Arizona, New Mexico, Sonora, Sinaloa, Durango, and western Chihuahua. Fourier analysis was used to reduce the twentyyear mean monthly values to six harmonic terms, four of which were then plotted on charts and studied. The results of this study indicate that an area consisting largely of the Sierra Madre Occidental in northwestern Mexico, and the portion of Arizona southeast of Tucson constitute a single rainfall province with a strong summer maximum of rainfall. This province also has a winter maximum but only in Arizona does the semi-annual term exceed the annual in amplitude. Within the United States the Gila and Rio Grande valleys constitute rainfall provinces of internally similar annual march, while the upland areas tend to resemble the Pacific coastal pattern to the west.
    • Variability of Precipitation in an Arid Region: A Survey of Characteristics for Arizona

      McDonald, James E.; Institute of Atmospheric Physics, The University of Arizona (Institute of Atmospheric Physics, University of Arizona (Tucson, AZ), 1956-12-31)
      A number of statistical and meteorological aspects of the temporal and spatial variability of precipitation in Arizona have been examined in terms of their bearing on the water resources of the arid southwestern United States. Most of the work summerized has been of the nature of initial exploratory investigations made in order to lay the foundation for the much more extensive studies that will shortly be begun as part of the University of Arizona-U.S. Weather Bureau Cooperative Punchcard Climatological program. A selected sample of long-record Weather Bureau precipitation stations in Arizona were analyzed for their historic variability properties, a number of statistical and calculational techniques were tested, and a general plan has been developed for the next phases of the Institute's variability program. It is believed that these findings will be of interest not only to investigators in arid regions themselves but also to investigators chiefly concerned with more humid areas; for, in many respects, the statistical characteristics of arid-lands precipitation pose the most stringent of all requirements on statistical methodology. In that sense, the quantitative results of the present report may serve as useful indicators of upper bounds on the effects of non-normality, skewness, and heteroscedasticity of precipitation frequency distributions for North America in general.