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Climate in the Parker Basin

Climate data from NOAA/NWS Co-op Network and AZMET stations are complied in Table 7.6-1 and the locations are shown on Figure 7.6-3.  Figure 7.6-3 also shows precipitation contour data from the Spatial Climate Analysis Service (SCAS) at Oregon State University.  The Parker 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 7.6-1A
  • There are five NOAA/NWS Co-op network climate stations in the basin.  The average monthly maximum temperature occurs in July at all stations and ranges between 94.8°F at Quartzite and 92.2°F at Bouse.  The average monthly minimum temperature occurs in January or December and ranges between 49.8°F at Bouse and 54.5°F at Ehrenburg 2E.
  • 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.  For the period of record used, the highest annual rainfall is is 5.89 inches at the Bouse and the lowest is 3.50 inches at Ehrenburg.


  • Refer to Table 7.6-1C
  • There is one AZMET station in the basin, Parker.  This station is at 308 feet and has an annual reference evaportranspiration of 82.91inches.

SCAS Precipitation Data

  • Refer to Figure 7.6-3
  • Additional precipitation data shows average annual rainfall as high as 10 inches along the eastern basin boundary and as low as four inches or less along the Colorado River on the western basin boundary.

Click here for Table 7.6-1

Table 7.6-1 Climate Data for the Parker Basin

Click here for Figure 7.6-3

Figure 7.6-3 Parker Basin Meteorolgical Stations and Annual Precipitation


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References and Supplemental Reading for the Parker Basin

Colorado River
Lower Colorado River Planning Area
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Imperial NWR
Parker Dam