My own figures (i.e. Luton, 113m AMSL) for the
30-day period 16 June to 15 July we

Mean max 19.9ºC - lowest since 2000
Mean min 10.2ºC - lowest since 1980
Overall mean 15.1ºC - lowest since 1981
Rainfall 71.8mm (about 155%)
Sunshine 180.6 hr (about 95%)

In the last 25 years, the mean max was lower in
2000, 1997, 1988, 1981, 1980 and 1978. The
mean min was lower only in 1980 and 1978.

Mid-June to mid-July 1980 gave:
Mean max 17.2ºC
Mean min 9.4ºC
Overall mean 13.3ºC
Rainfall 99.3mm
Sunshine 140.2 hr

Can't find anything else as cool as this all the
way back to 1950 (not even the infamous '54).

Mid-June to mid-July 1978 gave:
Mean max 18.5ºC
Mean min 9.3ºC
Overall mean 13.9ºC
Rainfall 65.2mm
Sunshine 159.0 hr

The mean sea-level pressure chart for
mid-June to mid-July 2004 showed a low of
1005mbar centred over Sweden, a high of 1025
mbar over the Azores, and a markedly
cyclonic/northwesterly flow over the British Is.
Arguably the most notable feature of these
mean charts during so-called 'poor' summers is,
possibly counter-intuitively, a large and intense
Azores High. However, this is just as much a
surface response to a strong trans-Atlantic jet
as is the displacement of the Icelandic Low
to the Scandinavia/Baltic region.

Philip Eden

Pardon my ignorance Philip, but what data do you use when calculating your
'overall mean'.
I do not produce an overall mean figure and am unsure what I would use it
for.

Before the entire ng collapses in mirth, may I explain that I produce a mean
max (the arithmetic mean of all the maxima) and a mean min (the arithmetic
mean of all the minima) but an overall mean seems to imply a mean of all the
temperatures which of course I don't record (nor I think does anyone else
unless they have an automatic electronic station rather then tubes of
mercury etc.).

Help appreciated...

Gianna

"Philip Eden" philipATweatherHYPHENukDOTcom wrote in message
...
My own figures (i.e. Luton, 113m AMSL) for the
30-day period 16 June to 15 July we

Mean max 19.9ºC - lowest since 2000
Mean min 10.2ºC - lowest since 1980
Overall mean 15.1ºC - lowest since 1981
Rainfall 71.8mm (about 155%)
Sunshine 180.6 hr (about 95%)

In the last 25 years, the mean max was lower in
2000, 1997, 1988, 1981, 1980 and 1978. The
mean min was lower only in 1980 and 1978.

Mid-June to mid-July 1980 gave:
Mean max 17.2ºC
Mean min 9.4ºC
Overall mean 13.3ºC
Rainfall 99.3mm
Sunshine 140.2 hr

Can't find anything else as cool as this all the
way back to 1950 (not even the infamous '54).

Mid-June to mid-July 1978 gave:
Mean max 18.5ºC
Mean min 9.3ºC
Overall mean 13.9ºC
Rainfall 65.2mm
Sunshine 159.0 hr

The mean sea-level pressure chart for
mid-June to mid-July 2004 showed a low of
1005mbar centred over Sweden, a high of 1025
mbar over the Azores, and a markedly
cyclonic/northwesterly flow over the British Is.
Arguably the most notable feature of these
mean charts during so-called 'poor' summers is,
possibly counter-intuitively, a large and intense
Azores High. However, this is just as much a
surface response to a strong trans-Atlantic jet
as is the displacement of the Icelandic Low
to the Scandinavia/Baltic region.

Philip Eden

"Gianna Stefani" wrote in message
...
Pardon my ignorance Philip, but what data do you use when
calculating your
'overall mean'.
I do not produce an overall mean figure and am unsure what I would
use it
for.

Simply shorthand for the average of the mean maximum and mean
minimum.

pe

Just a thought, some of the winters following these years had some
markedly cold spells. 1979, 1981, but this doesn't fit them all :-(

Keith (Southend)

On Mon, 19 Jul 2004 17:41:15 +0100, "Philip Eden"
philipATweatherHYPHENukDOTcom wrote:

My own figures (i.e. Luton, 113m AMSL) for the
30-day period 16 June to 15 July we

Mean max 19.9ºC - lowest since 2000
Mean min 10.2ºC - lowest since 1980
Overall mean 15.1ºC - lowest since 1981
Rainfall 71.8mm (about 155%)
Sunshine 180.6 hr (about 95%)

In the last 25 years, the mean max was lower in
2000, 1997, 1988, 1981, 1980 and 1978. The
mean min was lower only in 1980 and 1978.

Mid-June to mid-July 1980 gave:
Mean max 17.2ºC
Mean min 9.4ºC
Overall mean 13.3ºC
Rainfall 99.3mm
Sunshine 140.2 hr

Can't find anything else as cool as this all the
way back to 1950 (not even the infamous '54).

Mid-June to mid-July 1978 gave:
Mean max 18.5ºC
Mean min 9.3ºC
Overall mean 13.9ºC
Rainfall 65.2mm
Sunshine 159.0 hr

The mean sea-level pressure chart for
mid-June to mid-July 2004 showed a low of
1005mbar centred over Sweden, a high of 1025
mbar over the Azores, and a markedly
cyclonic/northwesterly flow over the British Is.
Arguably the most notable feature of these
mean charts during so-called 'poor' summers is,
possibly counter-intuitively, a large and intense
Azores High. However, this is just as much a
surface response to a strong trans-Atlantic jet
as is the displacement of the Icelandic Low
to the Scandinavia/Baltic region.

Philip Eden

Thanks
Much Appreciated.

Gianna

"Philip Eden" philipATweatherHYPHENukDOTcom wrote in message
...

"Gianna Stefani" wrote in message
...
Pardon my ignorance Philip, but what data do you use when
calculating your
'overall mean'.
I do not produce an overall mean figure and am unsure what I would
use it
for.

Simply shorthand for the average of the mean maximum and mean
minimum.

pe

"Philip Eden" philipATweatherHYPHENukDOTcom wrote in message
...

"Gianna Stefani" wrote in message
...
Pardon my ignorance Philip, but what data do you use when
calculating your
'overall mean'.
I do not produce an overall mean figure and am unsure what I would
use it
for.

Simply shorthand for the average of the mean maximum and mean
minimum.

pe

I calculate the mean temperature averaging all of my 15 minute AWS readings
and also calculating the mean as above. In general the two are within 0.2
deg C of one another so the average of the mean maximum and minimum gives a
reasonable result.

Alan

Ah now that I do find most interesting and also very surprising (retired
statistical analyst).
But I am fairly new to this weather thing after all.

Is there an online resource where I might obtain say 24 hours worth of such
data so that I could play with it ... ooops I mean examine it scientifically
(:

Gianna


"Alan Gardiner" wrote in message
...

"Philip Eden" philipATweatherHYPHENukDOTcom wrote in message
...

"Gianna Stefani" wrote in message
...
Pardon my ignorance Philip, but what data do you use when
calculating your
'overall mean'.
I do not produce an overall mean figure and am unsure what I would
use it
for.

Simply shorthand for the average of the mean maximum and mean
minimum.

pe

I calculate the mean temperature averaging all of my 15 minute AWS
readings
and also calculating the mean as above. In general the two are within 0.2
deg C of one another so the average of the mean maximum and minimum gives
a
reasonable result.

Alan