Springtime (MAM) maximum temperatures (daily high) are projected to warm by 2.9 to 4.1°F (1.6 to 2.3°C) by the middle of this century (2030-2059). This projection is the average of 10 global climate models using the IPCC’s A1B emissions scenario. A1B is a middle-level scenario for both carbon dioxide emissions and economic growth, with carbon dioxide levels rising from 390 ppmv at present to 550 ppvm by the mid-2050s.