NASA scientists can calculate the 1884 global temperature within 0.01C, and provide a very detailed map, despite having no data for most of the planet.
Global Temperature | Vital Signs – Climate Change: Vital Signs of the Planet
Data.GISS: GISS Surface Temperature Analysis (v4): Station Data
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Forget scientists. You might be forgetting to properly credit the NASA artists who also work so hard to make sure that things look like they oughta.