Upper-atmosphere densities derived from photographic meteor decelerations were analyzed to probe the existence of detectable oscillations with periods corresponding to solar and lunar tides (and half-periods) and seasonal variations. Extensive fragmentation in meteors adds considerable difficulty to the analysis and makes empirical corrections necessary. The mean height of the analyzed meteors is 91.8 kilometers. A seasonal variation with an amplitude of 15 per cent of the mean density barely emerges from its probable error by a factor of two; tidal oscillations, if present, are masked by observational scatter and could not exceed 10 per cent of the mean density.