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Climate in the Lower Gila Basin

Climate data from NOAA/NWS Co-op Network and AZMET stations are complied in Table 7.4-1 and the locations are shown on Figure 7.4-3.  Figure 7.4-3 also shows precipitation contour data from the Spatial Climate Analysis Service (SCAS) at Oregon State University.  The Lower Gila Basin does not contain Evaporation Pan or SNOTEL/ Snowcourse stations.  More detailed information on climate in the planning area is found in Section 7.0.4.  A description of climate data sources and methods is found in Volume 1, Appendix A.

NOAA/NWS Co-op Network

  • Refer to Table 7.4-1A
  • There are eight NOAA/NWS Co-op network climate stations in the basin.  The average monthly maximum temperature occurs in July at all stations and ranges between 94.6°F at Mohawk and 89.5°F at Dateland Whitewing R.  The average monthly minimum temperature occurs in January or December and ranges between 51.1°F at Wellton to 55.9°F at Kofa Mine.
  • Highest average seasonal rainfall occurs at most stations in the summer (July-September).  For the period of record used, the highest annual rainfall is 7.74 inches at the Ajo station and the lowest is 3.80 inches at Yuma Proving Ground.


  • Refer to Table 7.4-1C
  • There are two AZMET stations in the basin. The stations are at 299 feet and 535 feet and have an average annual reference evapotranspiration of 77.8 inches and 88.06 inches respectively.

SCAS Precipitation Data

  • Refer to Figure 7.4-3
  • Additional precipitation data show average annual rainfall as high as 16 inches in the Gunsight Hills south of Why and as low as four inches or less along the Colorado River in the western portion of the basin.

Click here for Table 7.4-1

Table 7.4-1 Climate Data for the Lower Gila Basin

Click here for Figure 7.4-3

Figure 7.4-3 Lower Gila Basin Meteorological Stations and Annual Precipitation

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References and Supplemental Reading for the Lower Gila Basin

Colorado River
Lower Colorado River Planning Area
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Imperial Dam
Welton Mohawk Agriculture