Summary for December, 2003

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HEADLINE: EARLY WET SPELL. DRY, COLDER MID-MONTH; MILD/DAMP CHRISTMAS

(last updated: 01/0900 JAN 2004)

Location: Tawfield/Wooden Hill area of SW Bracknell, Berkshire, UK

Altitude 80 m (other location details see signature file appended)

(temperatures [standard screen] degC; rainfall/melted snowfall mm; snow depths cm; )

Readings based on climatological day 0900 to 0900 UTC: in particular rainfall is read at 0900 UTC, then 'thrown-back' to the previous day.

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TEMPERATURES ETC.

Highest daily maximum (date):... 13.1(13)

Lowest daily minimum (date):...-03.6(08)

[ Lowest daily maximum (date):... 03.4(29)]

[ Highest daily minimum (date):... 08.9(26)]

Mean 24hr maximum:... 07.8

Mean 24hr minimum:... 02.4

Mean of 24hr max & min:... 05.1 (+0.2 on eLTA)

Nr of days minimum at 09UTC <0.0degC:09[dates: 07-09,16-19,22-23]

Nr of days maximum at 09UTC >=21degC:00

Nr of days maximum at 09UTC >=25degC:00

Nr of days maximum at 09UTC >=30degC:00

(Notes relating to temperature & allied observations: 1st: min recorded actually occurred 30/09Z DEC; 9th: min recorded actually occurred 08/09Z; 10th: max recorded (9.1) occurred 11/09Z; 11th: min recorded (0.5) occurred 10/09Z; 12th: max recorded (13.0) occurred 13/09Z; 19th: min recorded (-0.3) occurred 18/09Z, temperature rose through night; 19th: max recorded occurred at 20/09Z; 22nd: maximum (4.7) occurred at 23/09Z, day-max on 22nd 1.5degC; 23rd: minimum (-0.2) occurred at 22/09Z; 23rd: maximum (8.8) occurred 24/09Z; 31st: maximum (4.8) occurred at 01/09Z Jan;

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PRECIPITATION (PPN/mm)

Total rainfall/melted snow etc:... 065.8 (94% of eLTA 70mm)

Highest 24hr total:............... 11.6(12)

No. days PPN total >= 0.2:18

No. days PPN total >= 1.0:14

No. days PPN total >=10.0:01

No. days PPN total >=25.0:00

(Notes relating to precipitation & allied observations: 1st: r bec r(slight) csd by ~11Z; pr in afternoon; 2nd/3rd: light dr overnight; 5th/6th: dr, ocnl moderate, overnight & through morning 6th; 9th/10th: 'wet' fog overnight brought 0.1mm (actually just over that figure); 12th: r from 0845Z to ~1130Z, further r(slight)/ocnl r thereafter, with r(R) during night 12th/13th, rain csd by about 13/11Z; 20th: r from ~ 0745Z to ~10Z, then dr with pr ~13Z; 21st: ir(slight) ~ 0730-0800Z; 23rd: r(slight)/r from ~0545Z; 26th: ocnl r late aftn & during eve; 27th: r(slight)/r from about 19Z; 28th: prs(slight) ~1150Z; 29th: rain from at least 0530Z .. becoming moderate rain/rain-snow mixed from 0910 to ~11Z, then r(slight) thereafter; 30th: dr(slight) from 1030Z; 31st/1stJan: ocnl r (accompanied by gusty winds) early hours of the 1st January;

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OTHER TOTALS

Number of days thunder heard: (dates).. 00

Number of days hail < 0.5cm diameter:.. 00

Number of days hail >=0.5cm diameter:.. 00

Number of days snow/rain & snow:....... 02

Number of days snow lying at 09UTC:.... 00

Deepest snow cover (date,s):........... -

Number of days fog (visibility < 1km @ 09UTC).. 01

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Additional comments on the weather in December, 2003

30th/31st: dense fog for a short time overnight – dispersed by morning;

... these data can also be viewed at:-

http://homepage.ntlworld.com/metinfo/wxdata/climintro.htm

Tn Tx RR Tg Remarks

01 05.1 09.3 8.9 07.3 (min occurred 30/09Z)

02 05.9 09.5 0.6 04.4 -

03 06.4 08.6 - 06.9 -

04 07.2 08.4 - 07.2 -

05 07.7 08.2 1.1 07.3 -

06 01.0 08.1 tr -00.2 -

07 -00.3 04.3 - -02.3 -

08 -03.6 06.6 - -04.8 -

09 -01.8 08.2 0.1 02.1 (min occurred 08/09Z)

10 00.7 09.1 5.9 -01.4 (wet fog overnight 9th/10th = 0.1mm; max occurred 11/09Z)

11 00.5 11.2 1.9 00.0 (min occurred 10/09Z)

12 03.5 13.0 11.6 01.6 (max occurred 13/09Z)

13 06.5 13.1 0.6 11.3 (min during AM of 12th)

14 05.6 09.1 - 04.2 -

15 00.6 04.8 - -01.3 -

16 -03.1 04.5 - -04.3 -

17 -02.7 06.0 tr(x)-03.3 (tr=melted hoar frost night 17/18th)

18 -01.3 05.8 0.1x -03.0 (0.1mm=melted hoar frost night 18/19th)

19 -00.3 08.4 3.4 -01.4 -

20 04.5 11.7 4.1 03.2 -

21 03.4 06.5 tr 02.1 -

22 -00.5 04.7 2.1 -01.7 (max occurred 23/09Z)

23 -00.2 08.8 2.3 -00.1 (min occurred 22/09Z;max occurred 24/09Z)

24 04.7 09.3 - 06.4 (min occurred daytime 23rd)

25 08.7 10.6 0.4 08.1 -

26 08.9 10.3 2.2 08.3 -

27 02.6 07.2 3.7 00.8 -

28 02.2 05.0 3.9 00.7 -

29 01.4 03.4 5.9 -00.4 -

30 02.0 03.7 0.8 01.8 -

31 00.1 04.8 6.2 -02.0 (max occurred 01/09Z JAN)

Total rainfall for year (to 01/09Z JAN 2004) = 603.5mm (~ 86% of eLTA 704mm)

Amount and proportion of year's rainfall in each month:

Jan: 86.4 14%

Feb: 28.8 5%

Mar: 20.8 3%

Apr: 33.6 6%

May: 46.6 8%

Jun: 64.5 11%

Jul: 39.1 7%

Aug: 14.2 2%

Sep: 8.0 1%

Oct: 42.4 7%

Nov:153.3 25%

Dec: 65.8 11%