NOAA Confirms July 2019 was Hottest Month Since Records Began in 1880. Nine of the 10 warmest Julys have occurred since 2005, with the last five years (2015-2019) being the five warmest Julys on record. July 1998 is the only value from the previous century among the 10 warmest Julys on record. Download NOAA and NASA climate activity worksheets with interactive tools, resources for satellites view real-time datasets in an immersive, 3D visualization for desktop, watch 360 videos of earth and space.