Bracknell, Berkshire, UK (51° 24'N, 0° 46'W, 77m AMSL) September 2009

Mean Temp (integrated): 15.1 C
Mean Temp (daily (Tx+Tn)/2): 15.3 C

Mean Max: 20.2 C
Max Max: 27.2 C on 8th
Min Max: 16.1 C on 15th

Mean Min: 10.5 C
Min Min: 5.4 C on 27th
Max Min: 17.0 C on 8th

Average Dewpoint: 10.3 C
Max Dewpoint: 17.7 C on 8th
Min Dewpoint: 4.6 C on 27th
Wind Chill Low: 5.4 C on 27th
Average Wet Bulb: 12.6 C

Rainfall: 23.8 mm (25.8 mm in 5")
Max Rainfall: 13.4 mm on 2nd
Days with Rain = 0.2 mm: 6
Days with Rain = 2.0 mm: 2 (13.4 on 2nd and 8.6 on 15th)
Days with Rain = 20.0 mm: 0
Total Snow Depth: 0.0 cm
Max Snowfall: 0.0 cm
Days with Snow Lying: 0

Mean Pressu 1022.2 hPa
Max Pressu 1038.2 hPa on 11th
Min Pressu 993.5 hPa on 3rd
Bright Sunshine: 119.3 hr
Days of Air Frost: 0

Average Wind Speed: 3.0 kt
Maximum Daily Average Windspeed: 6.6 kt on 3rd
Minimum Daily Average Windspeed: 0.3 kt on 26th
Average Daily Max Wind Gust: 16.8 kt
Max Wind Gust: 29 kt from 180 deg on 1st
Dominant Wind Direction: NNE
Average Wind Direction: 313 deg
--
Roy Avis
Current Bracknell Weather plus Latest Statistics at: http://www.weatherfamily.org/bracknell
++++++++++++++++++++++++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++++++++
PC and all mail in/out check by latest version of Norton

In article ,
Roy Avis writes:
Mean Pressu 1022.2 hPa

That led me to wonder what the highest mean pressure is for (a)
September and (b) any month in the UK. (I suspect that January and
February might feature strongly in the latter category, winter Highs
tending to be more intense.)

Bright Sunshine: 119.3 hr

That's considerably lower than I would have expected. It seems to have
been a very sunny month in my part of Surrey, not that far away.

Average Wind Speed: 3.0 kt

That, together with the mean pressure, shows just how anticyclonic a
month it has been.
--
John Hall "Do you have cornflakes in America?"
"Well, actually, they're American."
"So what brings you to Britain then if you have cornflakes already?"
Bill Bryson: "Notes from a Small Island"

Hi John

Thanks for looking at my data!

The sunshine is calculated in my Weather Display software. The exposure is pretty poor due to
trees and houses around the site.
It is generally about 80% of that recorded by Bernard Burton in Wokingham.
As for pressure extremes, I don't have any data to hand.

Best Regards
Roy Avis
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"John Hall" wrote in message
...
In article ,
Roy Avis writes:
Mean Pressu 1022.2 hPa

That led me to wonder what the highest mean pressure is for (a)
September and (b) any month in the UK. (I suspect that January and
February might feature strongly in the latter category, winter Highs
tending to be more intense.)

Bright Sunshine: 119.3 hr

That's considerably lower than I would have expected. It seems to have
been a very sunny month in my part of Surrey, not that far away.

Average Wind Speed: 3.0 kt

That, together with the mean pressure, shows just how anticyclonic a
month it has been.
--
John Hall "Do you have cornflakes in America?"
"Well, actually, they're American."
"So what brings you to Britain then if you have cornflakes already?"
Bill Bryson: "Notes from a Small Island"

On 1 Oct, 09:54, John Hall wrote:
In article ,
*Roy Avis writes:

Mean Pressu 1022.2 hPa

That led me to wonder what the highest mean pressure is for (a)
September and (b) any month in the UK. (I suspect that January and
February might feature strongly in the latter category, winter Highs
tending to be more intense.)
]

John, these are our September mean pressure readings for September in
Coventry:
2009 1022.5
2008 1017.4
2007 1020.9
2006 1013.1
2005 1018.4
2004 1018.4
2003 1020.8
2002 1022.1
2001 1014.7
2000 1011.0
1999 1008.0
1998 1009.4
1997 1021.8
1996 1019.5
1995 1012.0
1994 1012.7
1993 1011.8
1992 1014.4
1991 1016.3
1990 1017.8
1989 1019.9
1988 1014.4
1987 1013.8
1986 1021.9
1985 1017.2
1984 1008.0
1983 1011.8

So last month recorded the highest mslp in Coventry in over 26 years.

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

On 1 Oct, 13:35, Steve J wrote:

By the way, the highest average pressure for any month in this period
was 1031.1mb in February 1987.



Steve Jackson
Bablake Weather Station
Coventry UKwww.bablakeweather.co.uk

On 1 Oct, 13:39, Steve J wrote:


Make that highest monthly mslp since 1983 1030.0mb in January 1992!

February 1987 was 1013.1mb!


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

Highest monthly mean MSL pressure at 09z for Wokingham in September in the
past 34 years is 1024.0 in 1986, (this Sept 1022.9). The highest for any
month in that period is 1031.7 in Feb 1993. The true mean from the AWS 00-24
data this Sept. is 1022.20 .
My sunshine 159.8 this Sept, Roy.

--
Bernard Burton
Wokingham, Berkshire, UK.

Satellite images at:
www.woksat.info/wwp.html

"John Hall" wrote in message
...
In article ,
Roy Avis writes:
Mean Pressu 1022.2 hPa

That led me to wonder what the highest mean pressure is for (a)
September and (b) any month in the UK. (I suspect that January and
February might feature strongly in the latter category, winter Highs
tending to be more intense.)

Bright Sunshine: 119.3 hr

That's considerably lower than I would have expected. It seems to have
been a very sunny month in my part of Surrey, not that far away.

Average Wind Speed: 3.0 kt

That, together with the mean pressure, shows just how anticyclonic a
month it has been.
--
John Hall "Do you have cornflakes in America?"
"Well, actually, they're American."
"So what brings you to Britain then if you have cornflakes already?"
Bill Bryson: "Notes from a Small Island"

In article ,
Bernard Burton writes:
Highest monthly mean MSL pressure at 09z for Wokingham in September in the
past 34 years is 1024.0 in 1986, (this Sept 1022.9). The highest for any
month in that period is 1031.7 in Feb 1993. The true mean from the AWS 00-24
data this Sept. is 1022.20 .

Thanks. Interesting that Feb 1993 (like Steve's Jan 1992) wasn't a
notably cold month IRRC, which I tend to associate with nearby
anticyclones in winter. Maybe it was mostly centred just
to the south of the UK to give a westerly or south-westerly flow..
--
John Hall "Do you have cornflakes in America?"
"Well, actually, they're American."
"So what brings you to Britain then if you have cornflakes already?"
Bill Bryson: "Notes from a Small Island"

On 1 Oct, 09:54, John Hall wrote:

That led me to wonder what the highest mean pressure is for (a)
September and (b) any month in the UK. (I suspect that January and
February might feature strongly in the latter category, winter Highs
tending to be more intense.)

Heathrow's highest Sept mean was 1024.1 mbar in Sept 1941. The highest
monthly mean in London/SE England for any month back to 1930 has been
Feb 1959, 0900 GMT means 1033.2 mbar at LHR, 1033.1 mbar at Kew,
1033.3 mbar at Gatwick. My personal highest in this area (records
since 1980) has been 1031.8 mbar in Feb 1993.

The highest monthly mean MSL pressure on record for the British Isles
that I'm aware of was 1035.4 mbar at Malin Head at 07h in Ireland in
February 1932 (mean at 13h was 1035.9 mbar). Mean pressure at 07h in
Feb 1932 exceeded 1030 mbar across the whole of the British Isles; the
lowest anywhere in BI during the monrth was 1014 mbar.

A 30 day mean split across January and February 1932 would probably
have slighly exceeded 1036 mbar, because on 26 January the barometer
reached 1051.0 mbar at Stonyhurst, Lancashire, at Sheffield and at
Meltham (West Yorkshire), 1050.4 mbar at York and 1050.3 mbar at
Sealand, Cheshire (the most recent occasion on which the barometer has
exceeded 1050 mbar anywhere in England), while 1047.4 mbar was
attained on 20 February at Inchkeith, Renfrew and Donaghadee.

More details and maps in my paper on intense anticyclones in Weather,
February 2007.

--
Stephen Burt
Stratfield Mortimer, Berkshire

In article
,
Stephen Burt writes:
snip
More details and maps in my paper on intense anticyclones in Weather,
February 2007.

Thanks for all the info. I have that issue of "Weather" and recall your
paper.
--
John Hall "Do you have cornflakes in America?"
"Well, actually, they're American."
"So what brings you to Britain then if you have cornflakes already?"
Bill Bryson: "Notes from a Small Island"