Quick calculation based on assumption average to 26th is currently 18.6 exactly (which it won't be).
26x18.6 = 483.6
Required for an 18.0C finish = 18.0x31=558
558-483.6=74.4
74.4÷ 5 (remaining days) =14.9approx. So for an 18C month today and the next 4 days must average at least 14.9C.
However, sadly, the usual downjustments mean we are probably on or short of 18.0 now- remember the expectations in July 2014?
Even so, with a 14.7 min last night (it's actually above 21C here at the moment) the last 4 days might only require about 14.5 per day.
Thoughts?
Bertie, Itchen Valley.
'We'll never see 40 celsius in this country'.