Is it hotter this summer than it has been in the past? How do we really know that climate change is happening? In this exercise, students will learn how to download freely available weather station data from the internet, using the National Oceanic and Atmospheric Administration (NOAA)'s Climate Data Online tool. This allows students to access decades of world temperature data from monitoring stations around the globe. Using these data, students will learn basic scientific programming in R Studio to import tables, and make plots, allowing them to visualize global changes in temperature, and fit a model to these data to make predictions and hypotheses about global trends, all while learning how to use modern tools used by real scientists.