May Cet

[chionomaniac]

Today is likely to see a drop in CET values, provided there is no late burst of warm sunshine this evening, in the northern CET zone so to speak maxes are struggling to get to double figures, what will prevent it dropping appreciably is the cloudy mild evening we are about to get... In fact, maxes this month so far have been quite poor, it is the warm minima due to cloud cover that has kept the CET as high as it currently is - this isn't so for Scotland where low minima have been consistent for much of the month.

I think the final CET for May will be a bit above average perhaps up to 1 degree above being not a bad guess particularly if we see high pressure come back on the scene - which will do wonders for maxes but ironically may well result in some below minima especially if we see heights continue to remain strong to the north ensuring rapid cooling at night.

How deceptive this weather can be, d.

Today the Hadley CET is up to 11.1C.

With last night coming in at 9.8C even if most areas in the CET zone don't rise above 12C (however many are around 17C) then we may actually see a small rise tomorrow!

[damianslaw]

How deceptive this weather can be, d.

Today the Hadley CET is up to 11.1C.

With last night coming in at 9.8C even if most areas in the CET zone don't rise above 12C (however many are around 17C) then we may actually see a small rise tomorrow!

Yes it is deceptive, maxes have been much higher in the CET zone than I had expected even under the cloud, I think the rain and cloud today masked my judgement as the source of air is quite mild with quite warm uppers..

[chionomaniac]

Yesterday came in at 12.0ºC which rises the Hadley CET by a half degree, which remains at 11.1ºC by virtue of being slightly below yesterday.

[Stu_London]

CET to 17/05/09

11.0C

[Snowyowl9]

Can`t see any warmth for the next 10 days with the cool/cold atlantic in full swing,until perhaps the last week maybe.

Could be looking at the coolest May since 1996.

[Tucco]

Month so far across the UK

http://www.met.rdg.ac.uk/~brugge/CURR.html

Mean temp ranges from 7.1C at Loch Glascarnoch to 12.7C at Shoeburyness. Discounting London Weather Centre due roof top location.

Temps appear slighty below average in the North and slighty above in the South only handful of Stations have exceeded 20C

Mark

Teesdale,Co Durham

[damianslaw]

Month so far across the UK

http://www.met.rdg.ac.uk/~brugge/CURR.html

Mean temp ranges from 7.1C at Loch Glascarnoch to 12.7C at Shoeburyness. Discounting London Weather Centre due roof top location.

Temps appear slighty below average in the North and slighty above in the South only handful of Stations have exceeded 20C

Mark

Teesdale,Co Durham

As expected the north has seen a slightly below average month so far , can't see it being anything but only slightly above average at best for the north at the finishing end but possibly 1 degree above overall in the CET zone - I think this is a high benchmark, temperatures look like being only a bit above average up to the end of the week and I can't see next week delivering a really very warm spell, but still no real cold or below average temps look like occuring..

[Kentish Man]

The CET is beginning to edge up a little - now on 11.1C (May 1 - 19) on both Climate UK and Hadley. This is 0.4C above the 1971/00 running mean.

[chionomaniac]

Hadley CET still on 11.1ºC today. How much can it rise before the end of the month? (Hopefully no higher than 11.9ºC with one eye on my own guess!)

[damianslaw]

It will be interesting to see what diurnal ranges may occur from now through to the end of the month, the warm days could be offset by some chilly nights which will have the effect of perhaps only raising the CET levels a few .1 degrees, I see 12 degrees being the very upper benchmark, think the finishing mark will be somewhere between 11.6 - 11.8 degrees, Tuesday and Wednesday next week look fairly average, so alot will depend on how warm daytime maxes can get later next week.

[stewfox]

Can`t see any warmth for the next 10 days with the cool/cold atlantic in full swing,until perhaps the last week maybe.

Could be looking at the coolest May since 1996.

Maybe it was hiding B)

72f today

CET will probably come out above 12c (mid week looks lower then a warm up)

Edited May 23, 2009 by stewfox

[Tucco]

CET starting to climb

CET: (May 1-23): 11.3°C (+0.4 degC)

E&W Rain: (May 1-23): 46.2mm (102 per cent)

E&W Sun: (May 1-23): 144.4hr ( 97 per cent)

© Philip Eden (If you wish to use or copy these figures, please acknowledge the source)

Range from 7.5C at Loch Glascarnoch to 13.1C at Shoeburyness.

http://www.met.rdg.ac.uk/~brugge/CURR.html

Mark

Teesdale,Co Durham

[Iceberg]

It stayed at 11.3 yesterday which I found very surprising.

Last night the temperature in the CET stations fell to between 10C at lowest at 12C. With the temp going up to 20 even 24C (again today as well), I would have thought a bigger increase.

Maybe upto 11.5 by tomorrow, maybe 12C by the end of the month.

[chionomaniac]

The CET (Hadley) hasn't updated for yesterday yet. There was a rise from the day before though.

[Weather-history]

Crikey, no June CET thread yet?

[North-Easterly Blast]

Again we avoid a cool May, and get yet again a slightly above average May. It is now 13 years since May was below average at all, and indeed only 2005 was near average since then. It seems to be a pattern that has struck with May - we don't seem to be able to achieve a CET below the 61-90 / 71-00 average in May any more. This pattern is also true of other months too - we don't seem to be able to achieve a below average April any more either, or even a CET much below 4*C in February any more. The same is true for June, we have struggled to achieve a CET below 14*C in June since 1991, we hardly ever seem to get a CET below 16*C in August any more.

[Iceberg]

Mr Eden's climbed 0.2 yesterday to 11.5.

[Weather-history]

we hardly ever seem to get a CET below 16*C in August any more.

Having said that recent Augusts have struggled to get much above average as compared to other months. There hasn't been an August 0.5C above the average either 1961-90 nor 1971-2000 wise in the last 4 years. You can't say that about any other month of the year in the last 4 years.

[chionomaniac]

Mr Eden's climbed 0.2 yesterday to 11.5.

Hadley CET also 11.5ºC upto the 25th.

[Thundery wintry showers]

Again we avoid a cool May, and get yet again a slightly above average May. It is now 13 years since May was below average at all, and indeed only 2005 was near average since then. It seems to be a pattern that has struck with May - we don't seem to be able to achieve a CET below the 61-90 / 71-00 average in May any more. This pattern is also true of other months too - we don't seem to be able to achieve a below average April any more either, or even a CET much below 4*C in February any more. The same is true for June, we have struggled to achieve a CET below 14*C in June since 1991, we hardly ever seem to get a CET below 16*C in August any more.

This is true statistically, but the synoptics this May haven't been especially cool. For instance we haven't had any northerlies this month, and northerlies are by far the main source of cold at this time of year. If we were getting repeated northerlies, no notable warm spells, and a CET inching slightly above average I would be more concerned.

[damianslaw]

This is true statistically, but the synoptics this May haven't been especially cool. For instance we haven't had any northerlies this month, and northerlies are by far the main source of cold at this time of year. If we were getting repeated northerlies, no notable warm spells, and a CET inching slightly above average I would be more concerned.

Yes this May has been completely devoid of any polar northerly air, quite unusual for May as it is the month when northerlies usually reach their yearly maxim, early May can be notorious for cold arctic outbreaks... many recent Mays have been 'easterly' months, I believe it has been the lack of arctic maritime and polar maritime airstreams in recent Mays which has led to them being above average.

[sundog]

quite unusual for May as it is the month when northerlies usually reach their yearly maxim, early May can be notorious for cold arctic outbreaks...

Northerlies seem to have been in very short supply these last number of months,since last Oct they have been very rare.

[Thundery wintry showers]

I would place the dividing line at March- I can't remember a northerly since 1st March other than very brief 24-hour things on the 5th and 28th. November had a northerly on the 22nd/23rd that delivered 3 inches of snow to Norwich, and the first halves of December and February both had frequent northerly winds. True, they weren't sourced very far north, but they did bring snowfalls to many places and temperatures a good few degrees below average.

[The PIT]

Hadley got the temp at 11.6C +0.6C above normal.

[GRHinPorts]

I would place the dividing line at March- I can't remember a northerly since 1st March other than very brief 24-hour things on the 5th and 28th. November had a northerly on the 22nd/23rd that delivered 3 inches of snow to Norwich, and the first halves of December and February both had frequent northerly winds. True, they weren't sourced very far north, but they did bring snowfalls to many places and temperatures a good few degrees below average.

TWS - Would Feb 15 be a more accurate dividing line? Its just that my recall is that after the very cold first half of Feb the last two weeks of the month saw mild south-westerlies move in. Indeed when I think of this homogenously mild Spring I think of it from that particular date.