Oriented archaeomagnetic samples were collected from 158 in situ features at 33 archaeological sites in the southwestern United States. Seventy-three independently dated features were used for analysis of secular variation. A moving-window technique with outlier rejection was developed to compute a smoothed secular variation curve. This technique incorporates weighted Fisher statistics to account for imprecision in both the age of remanence acquisition and the direction of magnetization for each feature. A mean direction and measure of dispersion is generated for each window of time. The secular variation record covers the period A.D. 750--1425, during which time the virtual geomagnetic pole (VGP) moves in a generally counterclockwise fashion from 86¿N, 83¿E at A.D. 750 to the lowest latitude position of 74¿N, 192¿E at A.D. 1075, and then to 85¿N, 236¿E at A.D. 1425. The median rate of VGP movement is 0.036¿ yr-1, similar to present-day rates. The Southwestern record shows close correspondence to other North American archaeomagnetic, limnomagnetic, and speleomagnetic records. The archaeomagnetic record can serve as the master curve for the deviation of archaeomagnetic dates. ¿ American Geophysical Union 1989