Wunderground data differs from NWS posted data.

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Wunderground data differs from NWS posted data. The minimum temperature reported by Wunderground for November 4, 2012 for Knoxville, TN shows 51. NWS shows 38.
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TBFollis

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Posted 6 years ago

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Brendan Hayes, Official Rep

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We use the NWS observation points, usually airports, but we don't use their forecasts anymore.
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TBFollis

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The data to which I was refering is not their forecast data. It's their posted historical data. On Monday morning, November 5, at 8:00am EST when I checked, they were showing 51 as the low for 11/04, but also noted that the readings were as of 5:00pm on 11/04. About an hour later, they had revised their information to show the low of 38, and noted their inrormation was as of earlier on 11/05. It looks like Wunderground retrieved the original data, but is not retrieving the revised data.