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Climate of the Morenci Basin

Climate data from NOAA/NWS Co-op Network and SNOTEL/ Snowcourse stations are complied in Table 3.9-1 and the locations are shown on Figure 3.9-3.  Figure 3.9-3 also shows precipitation contour data from the Spatial Climate Analysis Service (SCAS) at Oregon State University.  The Morenci Basin does not contain Evaporation Pan and AZMET stations.  More detailed information on climate in the planning area is found in Section 3.0.3.  A description of this and other climate data sources and methods is found in Volume 1, Appendix A.  For a link to the climate data source web page click its header.

NOAA/NWS Co-op Network

  • Refer to Table 3.9-1A.  
  • There are four NOAA/NWS Co-op Network stations in the basin.  The average monthly maximum temperature occurs in July at all stations and ranges from 61.6°F in Alpine to 84.7°F in Clifton. The average monthly minimum temperature occurs in December or January and ranges from 29.1°F in Alpine to 45.8°F in Clifton.

  • Highest average seasonal rainfall occurs primarily in the summer (July-September) or in the fall (October – December). For the period of record used, the highest annual rainfall is 21.66 inches at Alpine and the lowest is 13.29 inches at Morenci.


  • Refer to Table 3.9-1A.
  • The Morenci Basin is the only basin in the planning area with SNOTEL/Snowcourse data.
  • There are five SNOTEL/Snowcourse stations in the basin.
  • The highest average monthly snowpack at most stations is in March. 

SCAS Precipitation Data

  • Additional precipitation information shows rainfall as high as 32 inches along the Mogollon Rim near Highway 191 and as low as 12 inches in the vicinity of Clifton.

Click to view Table 3.9-1

Click to view Table 3.9-1 Climate

in the Morenci Basin

Click to view Figure 3.9-3

Click to view Figure 3.9-3 Morenci Basin Meteorological Stations and Annual Precipitation


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