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London for being warmer and sunnier when you use the same sunshine standard for both cities. London gets abut 1900 hours at the 120W/m2 threshold.
Really!? In the summer forecasts at least, Helsinki always seemed to be sunny with a lot of clear days too. London certainly doesn't get that during summer.
Heathrow's sunshine averages are measured at 120W/m2 now, but converted back to old CS measurements (as are all Met Office stations) before they are made public. Kew Gardens still uses CS and averages 1653 hours at 139.5W/m2 instead of 120, it would receive around 1917 hours if it recorded anything above 120.
There's an article here about a site in central southern England using a threshold of 100W/m2, and recording nearly 2650 hours, as opposed to the CS-corrected value of 1612 hours. http://measuringtheweather.com/wp-co...-July-2012.pdf
Warsaw used to use CS recorders, and averaged 1570 hours of sun. When they switched to an electronic sensor at 120W/m2, the sunshine averages shot up to a ridiculous 2200 hours.
Heathrow's sunshine averages are measured at 120W/m2 now, but converted back to old CS measurements (as are all Met Office stations) before they are made public. Kew Gardens still uses CS and averages 1653 hours at 139.5W/m2 instead of 120, it would receive around 1917 hours if it recorded anything above 120.
There's an article here about a site in central southern England using a threshold of 100W/m2, and recording nearly 2650 hours, as opposed to the CS-corrected value of 1612 hours. http://measuringtheweather.com/wp-co...-July-2012.pdf
Warsaw used to use CS recorders, and averaged 1570 hours of sun. When they switched to an electronic sensor at 120W/m2, the sunshine averages shot up to a ridiculous 2200 hours.
I find all of this very hard to believe, as all of Central Europe uses 120W/m2. It would make the British Isles a huge anomaly. The Warsaw's sensors must have been faulty, because places like Berlin don't get 2200 hours with the 120W/m2 treshold.
The Finnish readings are filtered for all kind of ground and air radiation to ensure the sensors don't pick up anything else but direct sun.
I find all of this very hard to believe, as all of Central Europe uses 120W/m2. It would make the British Isles a huge anomaly. The Warsaw's sensors must have been faulty, because places like Berlin don't get 2200 hours with the 120W/m2 treshold.
The Finnish readings are filtered for all kind of ground and air radiation to ensure the sensors don't pick up anything else but direct sun.
Heathrow uses a Kipp-Zonen recording 120W/m2 now, but the Met Office converts all of the data to CS values before releasing them, to maintain the same standards throughout climate history.
'Currently, Kipp & Zonen monthly totals are adjusted to Campbell-Stokes equivalent values prior to generating the sunshine grids.'
Kew Gardens still uses a CS recorder, I got the recording threshold for that station from a huge pdf document on the climate of London, which gives 0.2cal/min/cm2 (which is 139.5 W/m2).
London easily. Only a winter lover would rate this climate higher than London. London is warmer in winter and summer. Temps at night in the 40's in summer, no thanks. That is way too cool for summer nights for my liking.
Nice to see London winning this one. I swear many of the people that rag on the climate of London have never set foot in the place.
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