Scientists from the Western Regional Climate Center (WRCC) at the Desert Research Institute (DRI) in Reno, Nev. are pleased to announce the release of a long-awaited update to a climate mapping tool called the California Climate Tracker. Originally launched in 2009, the California Climate Tracker was designed to support climate monitoring in California and allows users to generate maps and graphs of temperature and precipitation by region. The 2018 upgrade incorporates substantial improvements including a more user-friendly web interface, improved accuracy of information based on PRISM data, and access to climate maps and data that go back more than 120 years, to 1895.