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The Monthly Climatic Data for the World is a site that "contains monthly mean temperature, pressure, precipitation, vapor pressure, and hours of sunshine for approximately 2,000 surface data collection stations worldwide and monthly mean upper air temperatures, dew point depressions, and wind velocities for approximately 500 observing sites. This is the final quality controlled copy and generally has a 4-6 month time lag." Browsable by date back to 1948. From the National Climatic Data Center.