LYCOS RETRIEVER 
Edwards Plateau: East
built 633 days ago
Average annual temperature for the Edwards Plateau is approximately 21°C. Monthly average temperatures vary from around 11°C in January to 30°C in August. Temperatures are lowest at the western, higher parts of the Edwards Plateau, and higher at the eastern, lower parts. But, as in the case of precipitation records, extremes are in several ways more important statistics for the biologist. July afternoon highs often range to 41° or 42°C and January night-time lows often approximate -10°C. The lowest night-time temperature ever recorded in the Plateau was about -23°C.
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In addition to transect data, records of butterfly species from the 16 counties of Edwards Plateau which have been reasonably well-collected (Fig. 2), were assembled from data points of the maps of Stanford and Opler (1993), their unpublished supplements for 1994 and 1995, annual summaries of the Lepidopterists' Society and unpublished data kindly provided by Mr. E. Knudson, the Zone 6 coordinator for the Society. The data from these two sources showed 227 butterfly species recorded from this area. Each species was categorized by taxon, geographic element, ecological habitat and range limit. Thirty-seven more species were not recorded east of Brewster Co. and are included in comparative totals and calculations only when appropriate.
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The southern and western portions of the Edwards Plateau are heavily altered by major encroachment of shrubs as a result of fire suppression. The eastern section of the plateau is in better condition and contains much second growth.
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