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Digital Atmosphere maintains a database of numerous monthly weather parameters for over 2,000 weather stations across the world. Most of this archive spans a 30-year time period. This data can be viewed on a graph or plotted on your maps.
Keep in mind that, as with most other meteorological data, the results may be affected by the observing station's elevation or proximity to the ocean. This is why you may see significant variations in temperature along a coastal region, among other effects.