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Climate in the McMullen Valley Basin

Climate data from NOAA/NWS Co-op Network and AZMET stations are complied in Table 7.5-1 and the locations are shown on Figure 7.5-3.  Figure 7.5-3 also shows precipitation contour data from the Spatial Climate Analysis Service (SCAS) at Oregon State University.  The McMullen Valley Basin does not contain Evaporation Pan or SNOTEL/Snowcourse stations.  More detailed information on climate in the planning area is found in Section 7.0.3.  A description of climate data sources and methods is found in Volume 1, Appendix A.

NOAA/NWS Co-op Network

  • Refer to Table 7.5-1A
  • Temperatures at the two NOAA/NWS Co-op Network stations in the basin range from a monthly maximum temperature of 88.1°F in July at Salome 6 SE to a monthly minimum temperature of 47.6°F at Aguila in December.
  • Average seasonal rainfall follows a bi-modal pattern with approximately one-third of the average seasonal rainfall occurring in the winter (January-March) season and one-third in the summer (July-September) season.  The highest average annual rainfall in the basin is 8.30 inches at the Aguila station.


  • Refer to Table 7.5-1C
  • There is one AZMET station in the basin, Aguila.  This station is at 2,149 feet and has an annual evaporation rate of 83.44 inches.

SCAS Precipitation Data

  • Refer to Figure 7.5-3
  • Additional precipitation data shows average annual rainfall as high as 18 inches in the Harcuvar Mountains along the northern basin boundary and as low as eight inches in the middle of the basin.

Click here for Table 7.5-1

Table 7.5-1 Climate Data for the McMullen Valley Basin

Click here for Figure 7.5-3

Figure 7.5-3 McMullen Valley Basin Meterological Stations and Annual Precipitation


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References and Supplemental Reading for the McMullen Valley Basin

Colorado River
Lower Colorado River Planning Area
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Eagle Eye Peak
Centennial Wash