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Climate in the Willcox Basin

Climate data from NOAA/NWS Co-op Network and AZMET stations are complied in Table 3.14-1 and the locations are shown on Figure 3.14-3.  Figure 3.14-3 also shows precipitation contour data from the Spatial Climate Analysis Service (SCAS) at Oregon State University.   The Willcox Basin does not contain Evaporation Pan and SNOTEL/Snowcourse stations.  More detailed information on climate in the planning area is found in Section 3.0.3.  A description of the 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.

  • Refer to Table 3.14-1A
  • There are six NOAA/NWS Co-op network climate stations in the basin.  The average monthly maximum temperature occurs in July at all stations and ranges between 74.8°F at Chiricahua N.M. to 79.5°F at Willcox.  The average monthly minimum temperature occurs in December or January and ranges between 42.6°F at Cochise Stronghold to 44.9°F at Fort Grant.

  • Highest average seasonal rainfall occurs in the summer (July - September). For the period of record used, the highest annual rainfall is 20.95 inches at Chiricahua N.M. and the lowest is 10.78 inches at Cochise 4 SSE.


  • Refer to Table 3.14-1C
  • There is two AZMET station in the basin,  Average annual evaporation ranges from 71.19 inches to 74.11 inches.

SCAS Precipitation Data

  • Additional precipitation data shows rainfall as high as 48 inches in the Chiricahua Mountains at Chiricahua Peak, elevation 9,760 feet.  This is the highest average annual precipitation in the planning area.  Precipitation is as low as 10 inches in the vicinity of the Pearce Sunsites station.
  • This basin contains the largest range of average annual rainfall in the planning area with 38 inches separating areas of lowest and the highest precipitation.

Click to view Table 3.14-1

Click to view Table 3.14-1 Climate Data for the Willcox Basin

Click to view Figure 3.14-3

Click to view Figure 3.14-3 Willcox Basin Meteorological Stations and Annual Precipitation


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