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Why is the lowest refresh interval to check for updated METAR data set at 30 minutes?

April 26, 2017Data interval lowest METAR Minutes Refresh updated

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Why is the lowest refresh interval to check for updated METAR data set at 30 minutes?

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The interval for reporting stations is set by the METAR standards at hourly in the US and half hourly for some other countries. I have found that some stations in the US do reports half hourly. An excerpt from the Help Guide for Developers is shown below.