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Climate of the Coconino Plateau Basin

Climate data from NOAA/NWS Co-op Network, Evaporation Pan and SNOTEL/Snowcourse stations are complied in Table 6.1-1 and the locations are shown on Figure 6.1-3.  Figure 6.1-3 also shows precipitation contour data from the Spatial Climate Analysis Service (SCAS) at Oregon State University.  The Coconino Plateau Basin does not contain AZMET stations.  More detailed information on climate in the planning area is found in Section 6.0.3.  A description of the climate data sources and methods is found in Volume 1, Appendix A.

NOAA/NWS Coop Network

  • There are five NOAA/NWS Co-op network climate stations in the basin.  The average monthly maximum temperature occurs in July and ranges between 83.0°F at Supai and 67.2°F at Grand Canyon #2.  The average monthly minimum temperature occurs in January and ranges between 40.7°F at Supai and 29.3°F at Grand Canyon National Park.

  • Highest average seasonal rainfall occurs at all stations in the summer (July-September). For the period of record used, the highest annual rainfall is 21.37 inches at Williams and the lowest is 8.76 inches at Supai.

Evaporation Pan

  • Refer to Table 6.1-1B
  • There is one evaporation pan station in the basin, Grand Canyon National Park 2.  This pan is at 6,790 feet and has an annual evaporation rate of 44.04 inches.


  • Refer to Table 6.1-1D
  • There are four SNOTEL/Snowcourse stations in the basin, one at the Grand Canyon and the others located in the San Francisco Peaks area.
  • The highest average monthly snowpack at most stations is in April. 

SCAS Precipitation Data

  • Additional precipitation data shows average annual rainfall as high as 40 inches at the southeastern tip of the basin and as low as four inches along the Colorado River.


Click to view Table 6.1-1

Click for Table 6.1-1 Climate of the Coconino Plateau Basin

Click to view Figure 6.1-3

Click for Figure 6.1-3 Coconino Plateau Basin

Meteorologic Stations and Annual Precipitation



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