Abstract. This article explores documentary evidence of droughts in Sweden in the pre-instrumental period (1400–1800). The database has been developed using contemporary sources such as private and official correspondence letters, diaries, almanac notes, manorial accounts, and weather data compilations. The primary purpose is to utilize hitherto unused documentary data as an input for an index that can be useful for comparisons on a larger European scale. The survey shows that eight sub-periods can be considered as particularly struck by summer droughts with concomitant harvest failures and great social impacts in Sweden. That is the case with 1634–1641, 1652–1657, 1665–1670, 1677–1684, 1746–1750, 1757–1767, 1771–1776 and 1780–1783 and 1641–1646. Among these, 1652 and 1657 stand out as particularly troublesome. A number of data for dry summers are also found for the middle decades of the 15th century and the 1550s.