Chilton seems more reliable than Reading ATM.
Also, the air seems less polluted- at 123m and relatively rural in S Oxfordshire, it's a truer reflection of UV potential in S England.
So a shift, but with regular comparisons in other sites, including Camborne.
The last week at Chilton (since last report):
4.0 4.2 4.0 3.9 4.1 3.6 3.8
Despite all the wet weather, late September is delivering nicely.
Bertie, Itchen Valley.
'We'll never see 40 celsius in this country'.