The RAF gets to chose where and how it makes it interceptions it has command and control over the UK
The Luftwaffe has no command and control when its aircraft are over England. The RAF has a considerable advantage.
and in terms of aircraft quality Id argue that there is less of a performance gap between spitfires and FW190's compared to Hurricanes vs 109's
in terms of aircraft performance compared with OTL the advantage lies with the RAF !
cheers Hipper
I would argue that a campaign aimed at coastal air defenses would in principle go better than OTL and the Germans do not need to really win. As seen above, I agree its not justified that British losses should be higher, but its immaterial for the strategic win (the feeling that this is but the prelude).
Regarding the weather, no need to argue, the daily weather reports are available. Certain not every day ideal for air attacks.
Here they are:
http://www.metoffice.gov.uk/learning/library/archive-hidden-treasures/daily-weather-report