Weather and climate processes play important roles in driving the deterioration of heritage. There has been increasing interest in how climate change is likely to affect heritage, with the IPCC AR6 Working Group II report stating with high confidence that both tangible and intangible heritage are already being lost due to changes in climate. Conventional climate parameters, such as average annual temperature, do not capture the risk that climate poses to heritage. This talk will firstly explore the concept of refining standard climate parameters for a heritage context so that past, present and future threats to heritage can be assessed. It will also explore how uncertainties in climate models influence our understanding of these heritage parameters, and subsequent decision making processes.