Head over to the NOAA CDO Search tool to grab your first dataset.
If you need raw, station-level data from across the globe, the is your best bet. This is the dataset used by climatologists to track global warming. Best for: Developers and researchers. noaa temperature data download
Note that some datasets have a lag, but most go back decades (or even a century). Head over to the NOAA CDO Search tool
This guide will walk you through the most efficient ways to access and download NOAA temperature data. station-level data from across the globe