Whenever you take an average there will be individual results that buck the trend and Darwin may well fit into this category but there will also be places that exceed the trend. The average will even these anomolies out.
We have a problem. If you want an average you put the data from the individual stations into the the database BEFORE it is averaged. You don't "correct" each data set and THEN find the average. The Darwin measurements should not be doctored, there is no reason for that.