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.
- 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
Click for Table 6.1-1 Climate of the Coconino Plateau Basin
Click for Figure 6.1-3 Coconino Plateau Basin
Meteorologic Stations and Annual Precipitation