"Philip Eden" philipATweatherHYPHENukDOTcom wrote in message
...

In 104 years of (homogenised) records in this vicinity, the six
warmest
Augusts
in respect of mean minimum temperature were 1997 (which broke
the previous
record by almost 2 degC), 1990, 2002, 2001, 2003 and 1995. This
marked
warming of summer nights is also apparent, though less strongly
so, in the
July figures.

.... the strong signal for increase in night minima also shows up
in the CET *annual* record as at:-

http://www.metoffice.com/research/ha..._dif_graph.gif

from the mid-1980's to present-day. Though it's worth pointing
out that this graph also indicates a similar rise (though
significantly lower values wrt today) during the 1890's which
then ran out of steam early in the 20th century.

Martin.

In uk.sci.weather on Mon, 8 Sep 2003 at 16:24:51, martin rowley wrote :

"Philip Eden" philipATweatherHYPHENukDOTcom wrote in message
. ..

In 104 years of (homogenised) records in this vicinity, the six
warmest
Augusts
in respect of mean minimum temperature were 1997 (which broke
the previous
record by almost 2 degC), 1990, 2002, 2001, 2003 and 1995. This
marked
warming of summer nights is also apparent, though less strongly
so, in the
July figures.

... the strong signal for increase in night minima also shows up
in the CET *annual* record as at:-

http://www.metoffice.com/research/ha...CETn_dif_graph.
gif

from the mid-1980's to present-day.

In my own records 1983-1992 minima were 0.8C lower than 1993-2002 on
average, with nights warming far more from Nov-Apr.
--
Paul Hyett, Cheltenham, England

On Mon, 8 Sep 2003 16:24:51 +0100, "martin rowley"
wrote:


"Philip Eden" philipATweatherHYPHENukDOTcom wrote in message
. ..

... the strong signal for increase in night minima also shows up
in the CET *annual* record as at:-

http://www.metoffice.com/research/ha..._dif_graph.gif

from the mid-1980's to present-day. Though it's worth pointing
out that this graph also indicates a similar rise (though
significantly lower values wrt today) during the 1890's which
then ran out of steam early in the 20th century.

I am by no means a global warming sceptic but I am cautious about what
I read. I'm interested particularly in the adjustments made for
urbanisation i.e. "Since 1974 the [CET] data have been adjusted by 1-2
tenths °C to allow for urban warming." which is copied from:
http://www.metoffice.com/research/ha...sdata/CET.html

However, significant urban warming was occurring before 1974. I recall
a paper published in "Weather" (IIRC) in the late 1960s or early 1970s
about increasing positive anomalies in the night minima at Manchester
Ringway since the 1940s. During this period of at least 20 years,
anomalies in the CET night minima appear to have been declining. Yet
there was a significant increase at Ringway which was attributed to
increasing urbanisation. I know this because I did the initial
research that prompted the article and I think the anomaly was around
+1 degree F over that period.

Can anyone supply a link to details of adjustments made to the CET for
urban warming and of the rationale? This would be much appreciated.

--
Dave