The hydrologic cycle is expected to change in profound ways under continued increases in atmospheric greenhouse gas concentrations and yet our understanding of how regional rainfall patterns will respond to anthropogenic climate change remains highly uncertain. The short (spanning roughly half a century) and unevenly distributed precipitation records around the globe currently limit our ability to constrain models and thus make confident projections of future precipitation responses (Biasutti et al., 2018). However, the efficacy of the climate models used to project future climate can be tested against past records. In particular, the last 2,000 years, known as the Common Era, has been a major reconstruction target for the paleoclimate community over the last decade (