Observations of thermospheric neutral winds have been made at Arecibo, Puerto Rico, by suing a Fabry-Perot interferometer to measure the Doppler shift of the nighttime O(1D) 630-nm emission. We have developed a scheme of making observations at eight equally-spaced azimuth positions with a constant zenith angle. This technique allows us to determine the mean neutral wind velocities in the meridional and zonal directions, as well as any horizontal gradients in the wind field. It also provides a good means of simultaneously monitoring any spatial variations in neutral temperature and the intensity of the O(1D) emission. In general, the highest equatorward wind velocity is observed at about 2100 LST. The meridional wind velocity usually lessens as midnight approaches and sometimes, but by no means always, reverses after midnight. The magnitude of the equatorward velocity is greater in summer than in winter months. For winter and spring months, the zonal windblows eastward throughout the night, with the velocity tending to decrease in a fairly regular fashion from about 125 m s-1 at 2100 LST towards zero by 0400 LST. In summer the pattern is similar, but the eastward flow usually reverses earlier, and a westward velocity of some 50 m s-1 may be attained by 0400 LST. Significant horizontal wind gradients are often observed in the meridional direction, but not in the zonal direction. Near midnight especially, during both the equinox and summer months, the equatorward wind is often greater to the north of Arecibo than to the south. We interpret this as being an effect of the passage of the midnight equatorial pressure maximum to the south of the station. Measurements of neutral temperature with the interferometer do indeed show that, between 0100--0200 LST, the neutral temperature to the south of Arecibo is enhanced by some 40 ¿K over that to the north.