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SW-NCA-color-FINALweb

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272 assessment of climate change in the southwest united statesFigure 13.4 Trends in heating and cooling degree days in major urban areas of theSouthwest. Trends in heating degree-days (left) and cooling degree-days (right) are based on 65°F(18.3°C) and 75°F (23.9°C) bases, respectively, for the period 1950 to 2009 in seventeen urban areas.Blue circles represent decreasing trends and red increasing trends. The trends are proportional to thediameter of the circles. Filled circles represent statistically significant trends. See glossary for definitionsof heating and cooling degree-days. Adapted from Mishra and Lettenmaier (2011) with permission fromthe American Geophysical Union.Figure 13.5 Trends in the annual1-day maximum daily precipitationamounts in major urban areas ofthe Southwest. Blue circles representdecreasing trends and red increasingtrends. The trends are proportional tothe diameter of the circles. Filled circlesrepresent statistically significant trends.Adapted from Mishra and Lettenmaier(2011) with permission from theAmerican Geophysical Union.

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