Results of a survey of Martian blue, bule-white, white, and dust clouds contained in the observational archives of the Association of Lunar and Planetary Observers and in the personal files of the late C.F. Capen, Jr. are presented. A statistical analysis of data extracted from the records of 9650 visual and photographic observations of Mars made from 1969 through 1984 has been performed. Seasonal frequencies and trend analyses for each type of observed Martian meteorology are presented. ¿American Geophysical Union 1990