This data file contains Python scripts for recreating the analysis presented in the manuscript. The manuscript figures are also included in this file. This dataset is associated with the following publication: Kelleher, M.K., P.E. Morefield, and K.M. Grise. Relationships Between Atmospheric Circulation and Southwestern United States 21st Century Precipitation Trends in Statistically Downscaled CMIP6 Models. JOURNAL OF GEOPHYSICAL RESEARCH: ATMOSPHERES. American Geophysical Union, Washington, DC, USA, 131(6): e2025JD044419, (2026).