Yeah, summer in England is typically a "standard day"...:)

These are the mean highs and lows for July - Oct 1940 for Lowestoft:

yyyy mm tmax tmin af rain sun

1940 7 20.2 11.0 0 157.6 211.3
1940 8 20.5 10.8 0 19.1 ---
1940 9 18.2 9.0 0 27.7 170.1
1940 10 13.9 7.6 0 37.8 ---

As you can see the mean temp for July-Aug is about 15.5c, Sept about 13.6c and 10.75c for Oct.
Southhampton:
1940 7 20.2 11.7 0 98.3 208.0 (mean = 15.9)
1940 8 22.1 12.1 0 0.0 238.1 ( Mean = 17.1)
1940 9 19.4 9.3 0 41.4 193.1 (Mean = 13.35)
1940 10 14.1 7.6 0 115.8 112.9 (Mean = 10.9)


And for Oxford:
1940 7 20.5 11.1 0 61.0 165.1
1940 8 22.1 11.1 0 1.8 199.5
1940 9 19.2 8.6 0 24.1 179.5
1940 10 13.9 6.0 1 67.1 95.5

Ross on Wye:
1940 7 19.7 10.5 0 72.8 166.8
1940 8 21.1 10.3 0 6.6 207.1
1940 9 18.6 7.3 0 18.0 183.6
1940 10 13.2 5.8 2 107.0 65.4

data from:
http://www.metoffice.gov.uk/climate/uk/stationdata/

But only a limited number of stations have data for 1940.

I certainly do believe that you believe that.

Pray tell us; where does the 100 octane deniers club meet?

Oh well I am just illustrating your auto convincing scenario. Just changed the desired subject to something more able to "boost" anyone.

And again, by the way, "denying" something that has not happened (or not in the sense you project it) is an utter non-sense grammatically.

Non believer I think is more correct.

more mean high and low temps for summer 1940
 

These are the mean highs and lows for July - Oct 1940 for Lowestoft:

yyyy mm tmax tmin af rain sun

1940 7 20.2 11.0 0 157.6 211.3
1940 8 20.5 10.8 0 19.1 ---
1940 9 18.2 9.0 0 27.7 170.1
1940 10 13.9 7.6 0 37.8 ---

As you can see the mean temp for July-Aug is about 15.5c, Sept about 13.6c and 10.75c for Oct.
Southhampton:
1940 7 20.2 11.7 0 98.3 208.0 (mean = 15.9)
1940 8 22.1 12.1 0 0.0 238.1 ( Mean = 17.1)
1940 9 19.4 9.3 0 41.4 193.1 (Mean = 13.35)
1940 10 14.1 7.6 0 115.8 112.9 (Mean = 10.9)


And for Oxford:
1940 7 20.5 11.1 0 61.0 165.1
1940 8 22.1 11.1 0 1.8 199.5
1940 9 19.2 8.6 0 24.1 179.5
1940 10 13.9 6.0 1 67.1 95.5

Ross on Wye:
1940 7 19.7 10.5 0 72.8 166.8
1940 8 21.1 10.3 0 6.6 207.1
1940 9 18.6 7.3 0 18.0 183.6
1940 10 13.2 5.8 2 107.0 65.4

Nairn (Scotland):
1940 7 16.0 10.4 0 215.2 99.0
1940 8 17.6 10.4 0 38.1 132.7
1940 9 14.5 7.9 0 42.2 104.7
1940 10 12.1 6.4 1 82.1 88.3


data from:
http://www.metoffice.gov.uk/climate/uk/stationdata/

But only a limited number of stations have data for 1940.

Nice site that.

Manston is a name we all know.
Temperatures are the mean daily max/min temps and the total rainfall for the month

In June 1940 the max temp was 20.4 c and the min temp was 11.7 with 3.8 mm of rain
In June 1941 the max temp was 17.2 c and the min temp was 10.9 with 15.2 mm of rain

and while we are on a roll
In June 2011 the max temp was 19.5 c and the min temp was 10.9 with 62.5 mm of rain

As far as the weather in the UK goes, you pays your money and takes your chance

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.

Have a look at this site for WX refs.

http://forum.netweather.tv/topic/631...weather-diary/

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

Wow.........

:rolleyes:

You guys really believe England meets standard atmospheric conditions for most of the day in August 1940??? Even with the temperature of 15C and 1013Mb?

You think England in August has RH = 0???

Come on all you pilots!!!

:rolleyes: