On Friday, September 25, 2015 at 7:21:53 PM UTC+1, Nick Gardner wrote:
On 25/09/2015 09:56, Graham Easterling wrote:
Well, sunshine figures look like being well up to normal, rainfall a little below, but like August a complete lack of any really warm weather.
Last September saw 18 days when the temperature reached 20C, this month just 1! The average temperature is 2C lower than last September, nearly 3C lower than September 2006.

9 days so far this month have had maximums greater than 20C but many
more have come very close.

Sunshine levels have been quite good for the last couple of weeks and
the total now stands at 168.7 hours. That's more than for August and
this month should pass July's total too.

Even with the sunshine, it has been a totally different month to
September last year when every day had a maximum greater than 20C and
the monthly mean temperature ended up at 16.7C.

This September has continued the summer trend with a dominance of cool
or cold nights but generally average day temperatures though with a
complete absence of any really warm of hot days.

It has been a strange summer.

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

September 2014 in Penzance had a mean temperature of 16.3C, just below your figure. This year (so far) 14.3C

The warmest September I've recorded was 2006 - 17.2C
The coldest were 1992 & 2012 - both 14.0C. This month will end up fairly close to the coldest.

I suspect the persistent cool pool in the Atlantic has had some influence, particularly here in the far west, during August & September. During June & July it was further west (the cool pool not Cornwall), with generally above average SSTs in the SW approaches Cornwall was rather insulated from it's effect.

Drifting (OT) - so be warned! One (of many) phrases that annoys me is 'wild swimming'. This is normally associated with space filling local news reports of middle class, 50sish overweight women walking down some steps into vaguely choppy water for a swim. That is not wild swimming, it's just swimming outdoors. Something which sane people do to avoid entering the hell which is a modern leisure centre.

However, today up at Godrevy I saw something which probably could classify as wild swimming. There was quite a swell running, and 2 people clambered down the cliff at Hell's Mouth (that in itself an achievement) than swam happily out to sea with the seals.http://www.easterling.freeserve.co.uk/hm.html

I felt really rather envious.

Graham
Penzance