I know the purists won't approve, but I have worked out the decadal
mean temperatures for Coventry since 1900.

Traditionally, the 30 year means run for climatological purposes from
1971 to 2000, so will be updated this time next year for 1981-2010.

We also need to take into consideration that in this 110 year record
there have been changes in location of instrument enclosures, the
observer (!) and type of equipment, so perhaps we can't read too much
into the minutiae thouh 30 year climatological normals do at least
smooth out some anomalies.

So with apologies to the purists, here are the decadal means for
Coventry, a city that has expanded in area some 5 times at least since
1900:

1900-1909 9.4C 1900-1929 9.5C
1910-1919 9.6C 1910-1939 9.6C
1920-1929 9.6C 1920-1949 9.5C
1930-1939 9.6C 1930-1959 9.4C
1940-1949 9.4C 1940-1969 9.2C
1950-1959 9.3C 1950-1979 9.2C
1960-1969 9.0C 1960-1989 9.4C
1970-1979 9.4C 1970-1999 9.8C
1980-1989 9.8C 1980-2009 10.2C
1990-1999 10.3C
2000-2009 10.6C

So by anyone's reckoning, this demonstrates that there *has* been some
warming in Coventry since 1900 (0.7C if we take 30 year normals into
account), but is this due to instrumental error, the growth in the
urban heat island effect, or greenhouse gas emissions, I wonder?

Steve Jackson
Bablake Weather Station
Coventry UK
www.bablakeweather.co.uk

In article
,
Steve J writes:
snip
So with apologies to the purists, here are the decadal means for
Coventry, a city that has expanded in area some 5 times at least since
1900:

1900-1909 9.4C 1900-1929 9.5C
1910-1919 9.6C 1910-1939 9.6C
1920-1929 9.6C 1920-1949 9.5C
1930-1939 9.6C 1930-1959 9.4C
1940-1949 9.4C 1940-1969 9.2C
1950-1959 9.3C 1950-1979 9.2C
1960-1969 9.0C 1960-1989 9.4C
1970-1979 9.4C 1970-1999 9.8C
1980-1989 9.8C 1980-2009 10.2C
1990-1999 10.3C
2000-2009 10.6C

So by anyone's reckoning, this demonstrates that there *has* been some
warming in Coventry since 1900 (0.7C if we take 30 year normals into
account), but is this due to instrumental error, the growth in the
urban heat island effect, or greenhouse gas emissions, I wonder?

The significant warming, possibly in the statistical sense and
definitely in the "man in the street" sense of "significant", seems to
have occurred in the last 30 years or so. Before that, apart from a cold
decade in the 1960s, every decade was within 0.15C of 9.45C.
--
John Hall "[It was] so steep that at intervals the street broke into steps,
like a person breaking into giggles or hiccups, and then resumed
its sober climb, until it had another fit of steps."
Ursula K Le Guin "The Beginning Place"

Steve,
Here are the similar values for Birmingham (of course, made up from
several sites, including Winterbourne) - showing a similar trend.

1881-1889 8.85

1890-1899 9.18

1900-1909 9.11

1910-1919 9.00

1920-1929 9.22

1930-1939 9.35

1940-1949 9.68

1950-1959 9.53

1960-1969 9.27

1970-1979 9.53

1980-1989 9.36

1990-1999 9.90

2000-2009 10.14


There ought to be some effects due to the UHI - so the increase of ~1.3C
since 1881 might not be as dramatic as it first appears, although the
increase since 1960 is notable.

Chris



"Steve J" wrote in message
...
I know the purists won't approve, but I have worked out the decadal
mean temperatures for Coventry since 1900.

Traditionally, the 30 year means run for climatological purposes from
1971 to 2000, so will be updated this time next year for 1981-2010.

We also need to take into consideration that in this 110 year record
there have been changes in location of instrument enclosures, the
observer (!) and type of equipment, so perhaps we can't read too much
into the minutiae thouh 30 year climatological normals do at least
smooth out some anomalies.

So with apologies to the purists, here are the decadal means for
Coventry, a city that has expanded in area some 5 times at least since
1900:

1900-1909 9.4C 1900-1929 9.5C
1910-1919 9.6C 1910-1939 9.6C
1920-1929 9.6C 1920-1949 9.5C
1930-1939 9.6C 1930-1959 9.4C
1940-1949 9.4C 1940-1969 9.2C
1950-1959 9.3C 1950-1979 9.2C
1960-1969 9.0C 1960-1989 9.4C
1970-1979 9.4C 1970-1999 9.8C
1980-1989 9.8C 1980-2009 10.2C
1990-1999 10.3C
2000-2009 10.6C

So by anyone's reckoning, this demonstrates that there *has* been some
warming in Coventry since 1900 (0.7C if we take 30 year normals into
account), but is this due to instrumental error, the growth in the
urban heat island effect, or greenhouse gas emissions, I wonder?

Steve Jackson
Bablake Weather Station
Coventry UK
www.bablakeweather.co.uk

On Dec 28, 7:21*pm, "Chris Kidd" wrote:
Steve,
* * * * *Here are the similar values for Birmingham (of course, made up from
several sites, including Winterbourne) - showing a similar trend.

1881-1889 * 8.85

1890-1899 * 9.18

1900-1909 * 9.11

1910-1919 * 9.00

1920-1929 * 9.22

1930-1939 * 9.35

1940-1949 * 9.68

1950-1959 * 9.53

1960-1969 * 9.27

1970-1979 * 9.53

1980-1989 * 9.36

1990-1999 * 9.90

2000-2009 * 10.14

There ought to be some effects due to the UHI - so the increase of ~1.3C
since 1881 might not be as dramatic as it first appears, although the
increase since 1960 is notable.

Chris

"Steve J" wrote in message

...



I know the purists won't approve, but I have worked out the decadal
mean temperatures for Coventry since 1900.

Traditionally, the 30 year means run for climatological purposes from
1971 to 2000, so will be updated this time next year for 1981-2010.

We also need to take into consideration that in this 110 year record
there have been changes in location of instrument enclosures, the
observer (!) and type of equipment, so perhaps we can't read too much
into the minutiae thouh 30 year climatological normals do at least
smooth out some anomalies.

So with apologies to the purists, here are the decadal means for
Coventry, a city that has expanded in area some 5 times at least since
1900:

1900-1909 * * * *9.4C * * * * *1900-1929 * *9.5C
1910-1919 * * * *9.6C * * * * *1910-1939 * *9.6C
1920-1929 * * * *9.6C * * * * *1920-1949 * *9.5C
1930-1939 * * * *9.6C * * * * *1930-1959 * *9.4C
1940-1949 * * * *9.4C * * * * *1940-1969 * *9.2C
1950-1959 * * * *9.3C * * * * *1950-1979 * *9.2C
1960-1969 * * * *9.0C * * * * *1960-1989 * *9.4C
1970-1979 * * * *9.4C * * * * *1970-1999 * *9.8C
1980-1989 * * * *9.8C * * * * *1980-2009 * 10.2C
1990-1999 * * * 10.3C
2000-2009 * * * 10.6C

So by anyone's reckoning, this demonstrates that there *has* been some
warming in Coventry since 1900 (0.7C if we take 30 year normals into
account), but is this due to instrumental error, the growth in the
urban heat island effect, or greenhouse gas emissions, I wonder?

Steve Jackson
Bablake Weather Station
Coventry UK
www.bablakeweather.co.uk- Hide quoted text -

- Show quoted text -

decadal means are interesting; those for Coventry given to 1dpl
(correct) whilst those for Winterbourne to 2 dpl - really neeeds an
explanation

john kings wrote:

decadal means are interesting; those for Coventry given to 1dpl
(correct) whilst those for Winterbourne to 2 dpl - really neeeds an
explanation

For me at least, that comment needs an explanation.

--
Graham P Davis, Bracknell, Berks., UK. E-mail: newsman not newsboy
"I wear the cheese. It does not wear me."

In article ,
Graham P Davis writes:
john kings wrote:

decadal means are interesting; those for Coventry given to 1dpl
(correct) whilst those for Winterbourne to 2 dpl - really neeeds an
explanation

For me at least, that comment needs an explanation.


I assume that John is implying that two decimal places of precision
cannot be justified.
--
John Hall "[It was] so steep that at intervals the street broke into steps,
like a person breaking into giggles or hiccups, and then resumed
its sober climb, until it had another fit of steps."
Ursula K Le Guin "The Beginning Place"

John Hall wrote:

In article ,
Graham P Davis writes:
john kings wrote:

decadal means are interesting; those for Coventry given to 1dpl
(correct) whilst those for Winterbourne to 2 dpl - really neeeds an
explanation

For me at least, that comment needs an explanation.


I assume that John is implying that two decimal places of precision
cannot be justified.

That was my guess, but I don't see why it isn't justified. I would
appreciate some education on this.

--
Graham P Davis, Bracknell, Berks., UK. E-mail: newsman not newsboy
"I wear the cheese. It does not wear me."