Climate data from NOAA/NWS Co-op stations are compiled in Table 5.4-1 and the locations are shown on Figure 5.4-3.  Figure 5.4-3 also shows precipitation contour data from the Spatial Climate Analysis Service (SCAS) at Oregon State University.  The Upper Hassayampa Basin does not contain Evaporation Pan, AZMET or SNOTEL/Snowcourse stations.  More detailed information on climate in the planning area is found in Section 5.0.3. A description of the climate data sources and methods is found in Volume 1, Appendix A. For a link to the climate data source web page click its header.

NOAA/NWS Coop Network

• Refer to Table 5.4-1A

• There are three NOAA/NWS Co-op network climate stations in the basin.  The average monthly maximum temperature occurs in July at all stations and ranges between 68.9°F at Groom Creek and  87.2°F at Wickenburg.  The average monthly minimum temperature occurs in January or December and ranges between 49.4°F at Wickenburg to 34.2°F at Groom Creek.

• Highest average seasonal rainfall occurs in the winter (January – March) and summer (July-September).  For the period of record used, the highest annual rainfall is 22.08 inches at Groom Creek and the lowest is 12.25 inches at Wickenburg.

SCAS Precipitation Data

• See Figure 5.4-3

• Additional precipitation data shows rainfall as high as 32 inches on the east central basin boundary and as low as 10 inches in the southern portion of the basin around Wickenburg.

Click to view Table 5.4-1 Climate Data for the

Upper Hassayampa Basin

Click to view Figure 5.4-3 Upper Hassayampa Basin

Meteorological Stations and Annual Precipitation

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References and Supplemental Reading for the Upper Hassayampa Basin