UK Mean Temperatures 2010-2015 from Met Office.gov.uk/pub/data/weather/uk/climate/datasafe

Are available....

Andy's right, this is a competition to predict the current month's CET, so past averages don't really matter and it's really for the fun of it, rather than the science.  Unless of course you're me and rely on some kind of inkling to prevent your guess going 5c (or more) too high!   

I'm happy to go with anything but it's easier for GW to go with what's available from the Met Office.  He puts a lot of time and effort into running this comp and I would hate him to give it up because we've put more pressure on his time.  So let's keep it light hearted, as it was meant to be from the start and leave it to GW to use whatever data suits him.   Amen!

It's been quite a warm day here but we started with a light frost, so that won't have done anything to increase the averages!  I need it to rise to prevent my slide down the table. 

Hear! Hear!

Met Office Hadley.       13.0c.     Anomaly     -0.8c.  Provisional to 26th.

Metcheck                    12.49c.   Anomaly     -1.23c.

Netweather                 13.09c.   Anomaly     -0.62c.

Clevedon Weather       15.09c.   Anomaly     -0.7c.

Mount Sorrel               12.5c.    Anomaly      -1.2c.

My  Mean                    13.4c.    Anomaly      -1.9c.

My Annual   11.2c.  Difference  5.5c.    

Not unhappy also. As I suggested, it is easy to use the MO figures. So no change then.! My point was if we were going to change then we should use the latest figures.. Not 30,40 or 50 years ago. 

What is the reason for the CET being based on 30 years and not 40 or 25 ect?

And why don't they use a rolling CET Average.  

It's the standard WMO practice to use 30 years.

http://journals.ametsoc.org/doi/pdf/10.1175/2010BAMS2955.1

has more info.

Also, note this bit:

"Decadal updates. The WMO mandates member countries to compute 30-yr normals once every 30 years (1901–30, 1931–60, 1961–90, 1991–2020, etc.), but recommends that member countries create decadal updates as well"

This is why some reports still use 61-90, as it's one of the base mandated periods. 81-10 is of course fine to use as well, but we won't see a big shift until 6 years' time, when 91-20 will become the period quoted everywhere.

Met Office Hadley         13.0c.     Anomaly      -0.8c.   Provisional to 27th.

Metcheck                     12.46c.   Anomaly      -1.27c.

Netweather                  13.05c.   Anomaly     -0.65c.

Clevedon Weather        16.8c.     Anomaly       0.2c

Mount Sorrel                12.5c.    Anomaly       -1.3c.

My Mean                      13.4c.    Anomaly       -1.9c.                       

September CET has gone under 13c! 

Met Office Hadley       12.9c.      Anomaly       -0.7c.    Provisional to  28th.

Metcheck                     12.45c.      Anomaly        -1.27c.

Netweather                  13.04c.      Anomaly        -0.66c.

Clevedon Weather        16.7c.        Anomaly         0.1c.

Mount Sorrel                12.4c.        Anomaly        -1.3c.

My Mean                      13.3c.       Anomaly         -2.0c.   

And yet, it's been a really pleasant month overall

I know the anomalously cool start to the month was the nail in the coffin for anything average or above, but I guess I was a bit tame with my prediction on that basis 

Ironically, my local mean seems to be heading for a finish at somewhere between 13.1*C and 13.3*C. Though even if the CET was doing the same, it's not like I can finish very high up the table this year anyway 

It's been a funny month hasn't it?

I remember September 93 and 94, the last time we had CET's like this, as being really cold, overcast and very wet months with flooding rains at times.

This month hasn't felt like that and I would guess much of this coolness has come from cold minima?

My own mean is 13.3c.   

  Time for OCTOBER'S to be thought about....

Yes, it's been a pleasant month here too, although I guess the low night temps have held down the mean. 

I have overcooked the temps this month and expect a fair old slide down the table.  My run of good guesses had to end!    

Sorry time has run away from me so very late with the October thread. Will post it up later this evening.

Good to see you on here Simon - I was just about to open the October thread for you. :-)

Latest estimate for the final September CET is 12.48C. We could be very close to finishing at the same figure as 1993.

Like has been said, much of it down to consistently cool minima. Saying that, I bet if we'd have just had an august like 2003, we'd probably be thinking this September had been decidedly chilly.

Yup, the weather gods farting in our face as usual

It will be 10.9C(-1.5C) here.

My Back Yard figure remains at  13.3c.    With an annual of 11.2c. ...

Year to date here is 8.7C

September av.max was 15C, Av. Min 6.6C

Highest 18.8C
Lowest 1.1C