Palaeoclimatic data provide essential insights into the climate of the Earth in the past, helping to understand long-term climate variations and their effects on human civilization and natural systems. In the construction industry, understanding past climate trends can play a significant role in planning and designing structures to withstand future climatic extremes and ensure safety. There are multiple sources of palaeoclimatic data, each providing unique information about historical climate conditions. These sources can be broadly categorized into direct and indirect evidence, with indirect evidence further divided into biological, geological, and chemical proxies. Direct palaeoclimatic evidence is obtained from historical records and written documents that describe weather patterns, seasonal changes, and extreme climatic events. Such records include diaries, chronicles, ship logs, agricultural records, and administrative documents that describe rainfall, floods, droughts, and temperature conditions. For instance, records of river flooding in ancient civilizations or reports of cold winters in medieval Europe provide valuable information about past climate variability. In the context of construction safety, these records help in understanding the frequency and intensity of extreme weather events that could impact the stability and design of structures. Knowledge of historical floods or storm surges, for example, can inform flood-resistant building practices or the reinforcement of embankments and foundations. Indirect palaeoclimatic data, also called proxies, are physical, chemical, or biological markers that reflect past climate conditions. One of the most important proxies is ice cores. Ice cores, extracted from glaciers and polar ice sheets, contain layers of ice formed over thousands of years. These layers trap air bubbles, dust, and isotopes, which provide information about past atmospheric composition, temperature, and precipitation patterns. The ratio of oxygen isotopes, particularly oxygen-16 and oxygen-18, indicates past temperature variations. Ice cores also record evidence of volcanic eruptions, industrial pollution, and major climatic shifts such as the Little Ice Age. For construction safety, ice core data inform engineers about historical patterns of snowfall, glacial advances, and melt rates, which can influence construction practices in cold regions, slope stability, and infrastructure resilience in areas affected by glacial runoff. Another crucial source is sedimentary records, including lake sediments, ocean sediments, and peat bogs. Sediments accumulate in layers over time, preserving pollen, microfossils, charcoal, and other organic materials. Pollen analysis, or palynology, helps reconstruct past vegetation patterns, which in turn reflect climate conditions such as temperature and precipitation. Charcoal layers indicate the occurrence