Global Records Databases
Currently, the Hadley Centre maintains the HadCRUT3, a monthly-mean global surface temperature analysis, and NASA maintains GISTEMP, another monthly-mean global surface temperature analysis, for the period since 1880. The two analyses differ in the details of how they obtain temperature values on a regular grid from the network of irregularly spaced observation sites; thus, their results for global and regional temperature differ slightly. The United States National Oceanic and Atmospheric Administration (NOAA) maintains the Global Historical Climatology Network (GHCN-Monthly) data base contains historical temperature, precipitation, and pressure data for thousands of land stations worldwide. Also, NOAA's National Climatic Data Center (NCDC), which has "the world's largest active archive" of surface temperature measurements, maintains a global temperature record since 1880.
Read more about this topic: Instrumental Temperature Record
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