Where can I get archived hourly temperature data? I am looking for historical hourly temperature data from many cities in the US what other data sources are there except wunderground?

UPDATE: I will use the data to compare stations from the same city and need data with high temporal &amp; spatial resolution; currently, one year of data is enough. I am not mentioning a specific US city because I need data from as many cities in the US as possible that meet my requirements. I am working on a big project of forecasting and I want to see the spatial deviations with in many large cities in the US.
The authoritative sources for your data are:


ASOS: Automated Surface Observation Systems at airports, and
MADIS:  the Meteorological Assimilation Data Ingest System, from NOAA


Those are collections based on calibrated, maintained equipment, with good geographic coverage.

And Wunderground already archives them, so it's a matter of selecting and using those, rather than the Wunderground data from their own source, the collection of personal weather stations.