The increased interest in climate change and variability has created a demand for more empirical data about past climate. In this work, new data sources with early meteorological data (temperature, pressure, wind direction and force, rainy days, cloudiness) of Cádiz (southern Spain) covering the short time period from 1799 to 1803 are presented and analyzed. Although the time coverage is short, these data can complete the studies previously published on the climate conditions during the beginning of the 19th century in Cádiz. An interesting change is detected in the seasonal behavior of temperatures, with cold (warm) summers in 1799 (1803), and the opposite behavior in winter. Except the year 1801, the rest of the years are characterized by wet conditions, under a predominant meridional circulation.