Autumn (SON) minimum temperatures (daily low) are projected to warm by 4.2 to 4.8°F (2.35 to 2.65°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.