On 25/05/2020 20:00, Brian Wakem wrote:
Away from coastal areas I think the UV forecasts are pretty accurate.Â* I
am about 28 miles from the south coast (crow miles) and usually peak
summer is high 6s, maybe nudging a 7 very occasionally.

Thanks Brian. I can add that as well as being away from the coast, also
being away from the South West will also see lower UV levels.

I have recorded a UV of 10.0 as my highest.

Every year I will at some point record a UV over 9.0 (under conditions
described by Graham). My UV readings are usually matched by the official
station at Camborne.

Deep blue, crystal clear sky usually delivers a lower UV. Such as today
when my maximum UV was 6.8 , which is on the lower side for this date. I
see that Camborne recorded 7.5 today. I suspect my UV sensor is a bit
dirty as I haven't cleaned it for a couple of years (it's on a mast).

After living in London & Birmingham for a while, I can testify that the
sun's UV strength seems much weaker at these places. And when I do
travel Up Country, the inhabitants do seem paler away from the South West.

--
Nick Gardner
Otter Valley, Devon
20 m amsl
http://www.ottervalleyweather.me.uk