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Climate in the Harquahala Basin

Climate data from NOAA/NWS Co-op Network and AZMET stations are complied in Table 7.3-1 and the locations are shown on Figure 7.3-3.  Figure 7.3-3 also shows precipitation contour data from the Spatial Climate Analysis Service (SCAS) at Oregon State University.  The Harquahala 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 the climate data sources and methods is found in Volume 1, Appendix A.

NOAA/NWS Co-op Network

  • Refer to Table 7.3-1A
  • Temperatures at the two NOAA/NWS Co-op Network stations in the basin range from an monthly maximum temperature of 91.0°F at Salome 17 SE in July to an monthly minimum temperature of 48.0°F at Harquahala Plains in January.
  • 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 6.36 inches at the Salome 17 SE station.


  • Refer to Table 7.3-1C
  • There is one AZMET station in the basin, Harquahala.  This station is at 1,150 feet and has an annual reference evaportranspiration rate of 82.13 inches.

SCAS Precipitation Data

  • Refer to Figure 7.3-3
  • Additional precipitation data shows average annual rainfall as high as 18 inches in the Harquahala Mountains at the northern tip of the basin and as low as four inches in the southern and western portions of the basin.

Click here for Table 7.3-1

Table 7.3-1 Climate Data for the Harquahala Basin

Click here for Figure 7.3-3

Figure 7.3-3 Harquahala Basin Meteorological Stations and Annual Precipitation


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References and Supplemental Reading for the Harquahala Basin

Colorado River
Lower Colorado River Planning Area
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Automated well
Power Plant in Harquahala Basin