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If you want to be consistent, you have to use the same station for all temperatures. You can't really use average high from one station and average low from another station.
It seems perfectly acceptable to use stations other than Heathrow when there is a cold spell (eg Hampstead), why does it suddenly become unacceptable when there is a warm spell? Just a few pages ago, some random poster showed up and said we should use a station like Hampstead to find out the average first 20c date, even though it's the anomaly in London.
People were perfectly fine using the sunshine averages from Greenwich, shouldn't they only use Heathrow too?
Posters in Miami, Sydney, LA, Chicago etc use whatever station they feel like.
Yes you do. This is how stats work. Otherwise, at the end of the month or year you can post the average high from station 1 because it's highest, the average low from station 2 because it's highest, record high from station 3 and so on. This is not how it is done.
Isn't Northolt just a few miles from Heathrow anyway? Same part of London, so it certainly counts IMO. If it was 30 miles away at the other side of London, then specify that it's not your local area, but if counting the City as a whole, then surely any station counts? If not, then why doesn't every city, no matter what the size, just have one weather station?
Obviously averages shouldn't be mixed between stations to cherrypick each one's best bits, but random days certainly counts for a cities statistics.
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