Met Office Hadley            11.00c.       Anomaly       0.5c Provisional to 12th.

Metcheck                         10.47c        Anomaly       -0.93c

Netweather                      11.28c        Anomaly       -0.03c

Peasedown St John       11.12c       Anomaly         -0.64c.          

Surely it can't drop any more now 

It's been fairly pleasant in the sun here today and wasn't exactly cold last night. Wouldn't be surprised if the 'CET' temp for much of NW England at least for this 24 hours is around the 12c mark.

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I'm not sure how usual or unusual it is for there to be such a big discrepency in the temperature anomalies between the minimum and maximum temperatures, but this shows just how big the average diurnal temperature ranges have been just recent as a result of high pressure being in charge for so much of the time.

Clear skies, light winds, dry air and dry soil (air pockets insulate) all contribute to this John. Deserts are classics for diurnal temperature changes, especially in spring.

Surely it can't drop any more now 

It's been fairly pleasant in the sun here today and wasn't exactly cold last night. Wouldn't be surprised if the 'CET' temp for much of NW England at least for this 24 hours is around the 12c mark.

I hope it doesn’t drop much more! Then hopefully, upwards and onwards!  

Amen to that !

It’s currently frosty at -2.2c here, so I would say another drop into the 10’s is highly likely today!  Fingers crossed for some good positive figures from here on.   

Met Office Hadley            10.8c          Anomaly        0.1c. Provisional to 13th.

Metcheck                         10.16c       Anomaly         -1.24c

Netweather                      11.03c       Anomaly        -0.28c

Peasedown St John        11.11c       Anomaly        -0.65c.     

It’s currently frosty at -2.2c here, so I would say another drop into the 10’s is highly likely today!  Fingers crossed for some good positive figures from here on.   

The following minima were recorded (to the nearest degree) last night in the CET locations:

Pershore      -3C
Stonyhurst   +0C
Rothamsted +2C

With maxima in the low teens yesterday and today, we'll see another drop today and I expect it will probably fall tomorrow too. 

Edit: Just seen Art's latest post 

May is normally the best month for the largest diurnal ranges - doesn't Rickmansworth hold the record?

Met Office Hadley          10.5c          Anomaly      -0.2c   Provisional to 14th.

Metcheck                       10.05c        Anomaly      -1.35c

Netweather                    10.8c          Anomaly      -0.51c

Peasedown St John      10.52c        Anomaly       -1.24c.           

May is normally the best month for the largest diurnal ranges - doesn't Rickmansworth hold the record?

No- that's an old August record for +1 to +29.

I think -7C to + 22C (Tummel Bridge?) in May 1978 pipped that.

The output's been oscillating wildly in terms of temps over the past week or so; depending on the run, we could be anywhere between about 10.5c and 13c.

Anyone who gets close this month will be down to pure luck more than normal.

Met Office Hadley               10.4c          Anomaly        -0.3c. Provisional to 15th.

Metcheck                             10.08c       Anomaly        -1.33c

Netweather                          10.76c       Anomaly        -0.55c

Peasedown St John          10.67c        Anomaly         -1.09c.        

Some very wild swings in temperature this month. After a fairly nondescript start to the month we had a couple of warm days followed by several days of very cold weather. Today may still be slightly below average but then it turns very warm by the middle of next week. The bank holiday weekend looks closer to average before turning warmer again in the final week of the month.

The main difference in the second half of May will be much warmer nights. Minimum temperatures this month have been way below average so far. The data below shows the difference in the anomalies for maximum and minimum temperatures in the first half of the month.

Minimum CET to 15 May 4.7C (1.65C below average)

Maximum CET to 15 May 15.2C (0.35C below average)

My CET mean estimate to 15 May is just 9.89C (0.93C below the 1981-2010 mean). This is 0.4C below the provisional Hadley figure. So a large downward correction looks likely this month.

The CET will bounce back in the second half of the month though. By the 30th I am currently expecting the mean to be at 12.3C.

Chart1

Chart2

Met Office Hadley            10.4c          Anomaly       -0.3c. Provisional to 16th.

Metcheck                         10.16c        Anomaly       -1.24c

Netweather                      10.81c        Anomaly       -0.5c

Peasedown St John        10.93c        Anomaly        -0.83c.   

Met Office Hadley           10.6c.          Anomaly         -0.2c Provisional to 17th.

Metcheck                        10.37c         Anomaly         -1.04c

Netweather                     10.95c         Anomaly         -0.36c

Peasedown St John      11.13c         Anomaly          -0.63c.

On its way up now!  Thanks for the stats GW.  Overnight temps are improving with double figures again last night and my 13c isn’t looking quite so sad now, although still too high.