Downloaded from https://www.everyspec.com temperature of 140 ° F (60 ° C); solar radiation (horizontal surface) at a rate of 355 Bph (1120 W/m 2 ) for not more than 2 hours (not concurrent with the extreme temperature); a windspeed between 10 and 16 fps (3 and 5 mps) during the period with temperature above 105 ° F (41 ° C); and a relative humidity of approximately 14 percent concurrent with the high temperatures (table 2-6). For elevations of 3,000 feet to 10,000 feet (914-3048 m), the ground surface temperature and wind remain the same.
Ambient air temperatures, however, decrease 5 ° F per 1,000 feet (9.1 ° C per 1,000 m) and solar radiation increases at a rate of 4 Bph per 1,000 feet (43 W/m 2 per 1,000 m). Figure TABLE 2-6. Basic Climatic Design Type: Hot Daily Cycle of Temperature, Humidity, and Solar Radiation. (QSTAG 360 Category A2) 14 AR 70–38 • 15 September 1979