It used to be that the data sources listed in the title of this post had a large number of metars from each state available to download each hour. Now, there are very few metars per state downloaded from those sources. The NWS metar source link still has everything, but one can't go back multiple days to look at complete/full plots from the previous few days, like we used to be able to do with NIU and COD data.
Does anyone know what happened to the data on NIU and COD that it is no longer anywhere near what it used to be?