This made me wonder what the maximum range is when comparing the highest CET (mean) and lowest CET on a daily basis for any particular month. If we got a CET of 12C for instance at the end of this month, then the difference would be the 24.5C on the 1st July compared to (say) 12C this week giving a difference of 12.5C

It turns out that for July data, 1948 has the record being 25.2 on 29th and 11.4 on 9th giving a difference of 13.8C. More recently 2001 had 23.0 on 29th and 12.7 on 15th giving 10.3

It seems the summer months JJA are the least variable in this measurement having no entries in differences of 14C or more out of a total for all months of 99 entries

The all time record for any month is Jan 1867 with a range of 19.4C being -9.3C on 4th and 10.1 on 27th. More recently November 2010 has 17.6C being 13.6 on 4th & 5th and -4.0 on 28th in the run up to the record cold December 2010

I see lots of discussion about this on the boards but I'm curious about the fact that the month started off warm and then declined to such an extent. Your two July examples have a more expected progression of warming increasing as we go into heart of summer. To me, it is not just the temp range but the timing and the fact that heat has been very near but unable to get into the bulk of the CET region.

Met Office Hadley       16.4c.      Anomaly      0.4c.  Provisional   to27th.

Metcheck                   16.62c.    Anomaly      0.15c.

Netweather       UPDATING SITE.

Clevedon Weather       17.3c.     Anomaly      2.0c.

Mount    Sorrel            16.9c.     Anomaly      0.4c.

My    Mean                   17.3c.    Anomaly      2.1c.   

I certainly have had my trousers pulled down and spanked this month  I really did think we would have another warm up the last 10 days 

Just a Ps to add..... Netweather   17.1c.     Anomaly    0.61c.... Back online...

.

This summer has never really got going here at all, other than a brief settled spell in the second week of June.

June wasn't great by any means, but this month is turning into an abomination. Only had one dry day that I can remember here in the past fortnight, which was last Tuesday. Has almost felt like the disaster that was 2012 all over again.

Met Office Hadley. 16.4c.  Anomaly.  0.3c. 

Are we actually going to finish up ever so slightly below average?

Would be almost bizarre given how hot it was four weeks ago right at the start of the month! I seem to recall that at that time, there was talk in some quarters about whether this month could rival or even beat July 2006 for heat. Seems a very long time ago now.

Coldest CET return of the month so far today at 12.95C by my calculations which is 4.5C below average.

The CET is expected to be 4.5C below average for the next two days as well.

Final CET still expected to come in at 15.99C.

Were it not for the fact that Deep Powder is taking a big penalty for a late prediction he would be leading the CET competition by a large margin at the end of this month. Despite the penalty he should still climb from 14th to 2nd place. A huge move. There will be lots of other changes in the top 10 this month.

We are going to be well below average - probably about 0.5C below the 1971-2000 mean and 0.7C below the 1981-2010 mean.

Oh dear - I can imagine this. This means I'm out by a full 2C. That I reckon must be my biggest margin I have ever been out.

I knew when I put my figure in we would not keep the heat - but no way could I forsee that July would turn into such a dreadful month this past 2 weeks.

No way.

Met Office Hadley       16.3c.       Anomaly      0.2c.     Provisional to  29th.

Metcheck                   16.38c.     Anomaly     -0.08c.

Netweather                16.89c.     Anomaly      0.4c. 

Clevedon Weather      17.1c.       Anomaly      2.2c.

Mount   Sorrel            16.6c.      Anomaly       0.1c.

My Mean                    17.1c.      Anomaly       2.3c.

My Annual     10.2c.   Difference   4.5c.    

As far as I recall, Glasgow was forecast to reach around 28C/29C on 1st July, and from what was reported at the time we did reach that, for the few hours the sun shone that day. It was extremely humid though; I remember being out for a walk for half an hour that afternoon that the air felt like an oven. It wasn't what I would call a pleasant heat at all.

Thankfully, the thunder we had that night freshened the air up somewhat., and by the end of the following weekend the temperatures here had returned to similar values to what we had for much of June.

Well, you're not alone - I had a right mare as well.

Met Office Hadley         16.2c.      Anomaly        0.1c.    Provisional to 30th.

Metcheck                     16.25c.    Anomaly        0.22c.

Netweather                  16.77c     Anomaly        0.28c.

Clevedon Weather         17.0c.     Anomaly        2.3c.

Mount Sorrel                 16.3c.    Anomaly         0.0c.

My   Mean                     17.0c.    Anomaly         2.4c.

My final CET estimate for July is 16.01C. Coldest day of the month was today with 12.63C

You know, I'm getting that 2010 feeling... its just that things have got into motion quite some way into the year this time. Whether we get a grand finale in winter is another matter 

Final official July CET from Hadley is 15.91C

http://www.metoffice.gov.uk/hadobs/hadcet/cet_mean_2015

So everyone was too high in the CET competition although lanky was the closest with 16.00C (along with Deep Powder although he gets less credit as his prediction was posted late after the initial heatwave started to abate).

http://www.metoffice.gov.uk/hadobs/hadcet/cet_info_mean.html