Quote:
Originally Posted by Seadog
That's for sure.
However, the main point to this, is that from about 1PM or earlier in the day, is likely have SL temps of ~15c or less. Mean Temps of 19C or higher would be rare and typically restricted to late afternoon. The idea being pushed by the 100 Octane Deniers that English Summer Weather automatically means 19c or higher is nonsense.
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And have a look at this
Report on London Weather 1940:
July:
Cool, with above average rainfall and sunshine.
August:
Very dry with above average sunshine and slightly below normal temperatures.
September:
Rather cool, dry and sunny.
October:
Rather cold with above average rainfall and slightly below normal sunshine.
Cool, slightly
below normal temperatures, etc - and London, as a large, urban environment can be approx 2° C warmer than rural areas.
Mind you, that's only talking about temperatures at ground level - the temperatures and pressures can fluctuate at altitude depending on all sorts of conditions - to make a flat statement that performance is conditional on "
High density altitude conditions of summer" is a gross over simplification of what can happen in reality.
Britain is an Island, not a large continent like America and its weather patterns are conditioned by the oceanic (Atlantic) climate. So flight conditions over S-E Eng are very different to those over continental America. As an example the 8th AF USAAF found flight conditions in Britain to be very different to those most of its trainee pilots and aircrew had encountered at their American based flight training schools, even during the summers.
Another site on Britain's weather patterns
http://www.metlink.org/weather-clima...imate.html#2.1