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Phoenix AMA Climate

Climate data from NOAA/NWS Co-op Network, Evaporation Pan and AZMET stations are complied in Table 8.1-1 and the locations are shown on Figure 8.1-3.  Figure 8.1-3 also shows precipitation contour data from the Spatial Climate Analysis Service (SCAS) at Oregon State University.  The Phoenix AMA does not contain SNOTEL/Snowcourse stations.  More detailed information on climate is found in Section 8.0.3.  A description of the climate data sources and methods is found in Volume 1, Appendix A.

NOAA/NWS Co-op Network

  • Refer to Table 8.1-1A
  • There are 41 NOAA/NWS Co-op Network stations in the AMA.  The average monthly maximum temperature occurs in July at all stations and ranges between 105.8°F and 86.8°F. The average monthly minimum temperature occurs in January or February and ranges between 31.8°F and 60.5°F.
  • Highest average seasonal rainfall occurs in the winter (January-March).  For the period of record used, the highest annual rainfall is 24.8 inches at Superior 2ENE station and the lowest is 5.91 inches at the Tonopah 5NE station.

Evaporation Pan

  • Refer to Table 8.1-1B
  • There are five evaporation pan stations in the AMA.  Elevation at the stations range from 1,170 feet to 1,650 feet and the corresponding annual average evaporation ranges from 74.3 inches to 117.5 inches.


  • Refer to Table 8.1-1C
  • There are 7 active and 3 inactive AZMET stations in the AMA.  Elevation at the stations range from 1,000 feet to 1,700 feet and corresponding annual average evaporation ranges from 80.94 inches to 73.15 inches.

SCAS Precipitation Data

  • See Figure 8.1-3
  • Additional precipitation data shows average annual rainfall as high as 28 inches on the AMA boundary north of Cave Creek and as low as six inches in the southwestern portion of the AMA.

Click to view Table 8.1-1

Table 8.1-1 Climate of the Phoenix AMA

Click to view Figure 8.1-3

Figure 8.1-3 Phoenix AMA Meteorologic Stations and Annual Precipitation


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