Extremes hundreds of years ago…scientific analysis of historical documents about the 16th-century climate of Transylvania, Romania… reveals a pattern of intense extreme weather events, frequent and intense heat waves and droughts.

The Germany-based European Institute for Climate and Energy (EIKE) presents it s latest video: “Kleine Eiszeit verursachte Wetterextreme – Klimaschau 232“ (Little Ice Age Caused Weather Extremes – Climate Show 232).

Figure 3 of Gaceu et al 2025

The video addresses the effects of the Little Ice Age (approx. 1400–1850) and argues that extreme weather events are not a new consequence of CO2-caused climate change, but are historically normal, especially during colder centuries.

These findings are based on a study by Romanian scientists who analyzed 500-year-old diaries and archival data from the 16th century in Transylvania (Siebenbürgen) to document how the Little Ice Age changed life in the region. Here’s what they found:

• Initial Heat and Drought: In contrast to Western Europe, where temperatures dropped in the 16th century, Transylvania initially recorded more hot and dry weather in the first half of the century. A striking source describes the summer of 1540, during which springs dried up, rivers shrunk, and people prayed for rain.
• Late 16th Century Extremes: The second half of the century was marked by heavy rainfall and floods, especially in the 1590s. Later writings document increasing cold waves and harsh winters, suggesting that the Little Ice Age may have manifested later in this part of Europe.
• Climate-Related Catastrophes: Such weather changes often led to disasters directly or indirectly linked to the climate, including 30 years of plague, 23 years of famine and 9 years of locust plagues.
• Human Adaptations: The weather extremes and catastrophes may have led to changes in settlement patterns, for example, through the introduction of flood-resistant infrastructure or migration to more favourable areas. Technological innovations such as improved irrigation systems or storage facilities may also have been advanced.

Summary

The Romanian authors reveal from an analysis of historical documents that reconstructed the 16th-century climate of Transylvania that there was a pattern of intense extreme weather events. There were frequent and intense heat waves and droughts in the first half of the century, contrasting with the climate in Western Europe.

Ultimately, these extremes, which later included increased rainfall and flooding, had a profound socio-economic impact, leading to famine, disease, and mortality.