The patch fixes the uninitialized values by explicitly starting
everything at sea_level values.
FGEnvironment::FGEnvironment()
: _temperature_degc_table(new SGInterpTable),
_pressure_inhg_table(new SGInterpTable),
+ elevation_ft(0),
visibility_m(32000),
temperature_sea_level_degc(15),
+ temperature_degc(15),
dewpoint_sea_level_degc(5), // guess
+ dewpoint_degc(5),
pressure_sea_level_inhg(29.92),
+ pressure_inhg(29.92),
wind_from_heading_deg(0),
wind_speed_kt(0),
wind_from_north_fps(0),