PARC has developed a database of Canadian Prairie Provinces’ climate over past centuries. This product makes PARC unique among Canadian organizations providing climate services. It has proven to be a very useful complement to data derived from weather stations and climate models, and popular among stakeholders in our region since proxies of past climate capture natural and real – as opposed to modeled – variability. Because the monitoring of weather since the late-19th century has coincided with the period of greenhouse gas forcing of the global climate, weather data capture both natural climate variability and anthropogenic climate change. On the other hand, proxy climate data that predate the industrial revolution record only natural climate variability (e.g., Figure 1). Recent research has demonstrated that the natural variability of prairie climate is a major source of uncertainty in the projection of regional climate change. Also, a significant question that occurs to both scientists and practitioners is the extent to which global warming has caused the regional climate to depart from the historical climate regime to which social and ecological systems are adapted.