How do I read the temperature/dewpoint graph in the Hourly Forecast?

Red is the temperature, green the dewpoint. If the temperature is 50 and the dewpoint is 25, the green bar for dew point will be half as high as the temperature, thus green will fill up 50% of the total bar area. If the dew point is equal to the temperature, then green will fill up 100% of the bar, and you won't see any red.

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