June 2019 monthly global temperature difference map. The temperature difference the current temperature and a historical average is colour-coded: blue for cooler temperatures and yellow to orange and red for hotter temperatures. The historical average used is the 30-year period from 1951 to 1980. June 2019 was the hottest June in the 140-year temperature record. Nine of the 10 hottest Junes have occurred since 2010. This is part of the evidence for climate change and global warming. This images uses the NASA Goddard Institute for Space Studies (GISS) Surface Temperature Analysis dataset (GISTEMP).