Coldest June 28th on record

[xmetman]

.

Yesterday, was the coldest June 28th in the last 139 years of the daily CET series. The mean maximum temperature of just 14.5°C was -4.24°C below the long-term average. The cold day across the country, particularly in the wet east, is what prompted me to write this Colder than Christmas! article yesterday

[Jack Harrison]

Statisticians interpret please.
Is 0.065 degC / decade cooling significant?  Or would that statistically be within normal variation?

Am I allowed to be a pedant?  That Met Office graph (top left) says cooling - 0.065 C /decade.  A negative cooling is in fact a warming, I am sure not what was meant.  Pedant hat removed.

A cursory look at: https://skyvector.com/ and the temperatures worldwide today suggest that the northern hemisphere is cooler than recent days (admittedly a very broad unscientific look). I find it difficult to understand that everywhere can be cooler: there seem to be few compensating warmer areas except possibly northern Russia.  Even the Sahara is enjoying a cold spell.  Daua Adrar is - by normal standards - perishing cold at a mere 48C.  By comparison, somewhere in Iran yesterday I saw a 52C.

Jack -  keeping warm in my centrally heated bungalow!

[Brian Wakem]

It didn't seem like a particularly extreme day in anyway.  Was June 28th's coldest day record a particularly weak record compared to surrounding days?

Just putting my pedantic hat on for second, a particular bugbear of mine is when people quote negative negative anomalies.  -4.24C below average would actually be 4.24C above average in the same way that is you subtract -4.24 from zero you get +4.24.

[Brian Wakem]

On Thursday, 29 June 2017 16:51:58 UTC+1, Jack Harrison wrote:

Am I allowed to be a pedant?  ... Pedant hat removed.

I think we have the same hat! 

[xmetman]

OK, I see what you mean, a double negative in fact.

[xmetman]

Jack

I take you point about the double negative anomaly.

I'm not saying that all places in the world are cooler, or anywhere else come to that, just that a linear trend for all the 28th of June since 1878 in the Central England Temperature series is negative.

Bruce.

[Trevor Harley]

It was the latest date I have recorded such a low temperature (10.5C near Dundee).

[Jack Harrison]

Trevor

:It was the latest date I have recorded such a low temperature (10.5C near Dundee).

Are you sure it isn't the earliest?  After all, the evenings are now drawing in.

Jack