Tainan International Airport / Tainan Air Base lies in the tropics at 22.95° N, 120.21° E, on Asia/Taipei time (UTC+8). Tropical airports contend with heat and humidity, both of which thin the air and lengthen takeoff runs, and with convective storms that build fast in the afternoon.
Tainan International Airport / Tainan Air Base has 2 runways. The longest, 18L/36R, measures 10,007 ft by 148 ft, which puts the field in the long-haul capable category: widebodies operate comfortably, though the very longest sectors may need a payload trade. The surface is concrete. Both are lit for night operations.
Runway 18L/36R is aligned roughly south/north, which is the clearest hint you get about the prevailing wind here: runways are built to face the wind that blows most often, because aircraft take off and land into it. Every runway here shares that south/north alignment, so a strong crosswind means a crosswind landing rather than a switch to another strip.