Global Historical

The Global Historical Climatology Network (GHCN) is an integrated database of climate summaries from land surface stations across the globe that have been subjected to a common suite of quality assurance reviews. The data are obtained from more than 20 sources. Some data are more than 175 years old while others are less than an hour old. GHCN is the official archived dataset, and it serves as a replacement product for older NCEI-maintained datasets that are designated for daily temporal resolution (i.e., DSI 3200, DSI 3201, DSI 3202, DSI 3205, DSI 3206, DSI 3208, DSI 3210, etc.).

Data File Access
For users who know the exact data they need and are comfortable using FTP.
Data Access via Climate Data Online (CDO)
For users who are not certain of the exact data they need or are not comfortable using FTP.
GHCN Monthly
Temperature dataset that contains monthly mean temperatures and is used for operational climate monitoring activities.

Source: www.ncdc.noaa.gov

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The Global Historical Climatology Network (GHCN) is a database of temperature, precipitation and pressure records managed by the National Climatic Data Center, Arizona State University and the Carbon Dioxide Information Analysis Center.
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