Question : transform data values captured by minute to hourly average

I need to transform a data dump from minute readings to hourly averages.

Answer : transform data values captured by minute to hourly average

Or, to return the hour as a datetime value:

SELECT [date], TimeSerial(Hour([time]), 0, 0) AS Hr, Avg([value]) AS HourlyAvg
FROM YourTable
GROUP BY [date], TimeSerial(Hour([time]), 0, 0)
ORDER BY [date], TimeSerial(Hour([time]), 0, 0)