"Temperature datasets" refers to collections of information about temperatures recorded at different locations over a specific period of time. Full definition
The above plots of temperature datasets from different climate agencies / organizations clearly indicate that the feared accelerating and runaway warming predicted did not happen, ever. (c3headlines.com)
[26] There are ongoing efforts to resolve differences in satellite temperature datasets. (en.wikipedia.org)
The spread in the global averages from various temperature datasets has been unusually large over the past two years or so. (climate.copernicus.eu)