Americans are so enamored of equality that they would rather be equal in slavery than unequal in freedom.
Alexis de Tocqueville
The instrument record starts in about 1880 and is based on a very USA centric set of data since then. The Satellite record stats in about 1980 and that is where the reliable Global temperatures begin.
What you are talking about is proxy data and not instrument data.
Historical Station Distribution « Climate Audit