Summary for January 2005

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HEADLINE: DRY/MILD OVERALL. WINDY FIRST HALF; COLD SPELLS AFTER MIDMONTH

(last updated: 01/0900 FEBRUARY)

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

Altitude 80 m (other location details see elsewhere on web site.)

(temperatures [standard screen] degC; rainfall/melted snowfall mm; snow depths cm; ) Readings taken at 0900 and 1800 UTC. Where the NIGHT maximum

or DAY minimum are significantly different from figures hereunder, this will be noted in the accompanying text summary. There are now two mean daily temperatures shown: the first is the mean of the average day maximum and average night minimum (A), and the second is the average of the 24hr maximum and 24hr minimum (B .. as kept formerly) .. the anomalies are shown for this latter figure from 1971-2000 estimated Long Term Averages. Rainfall is credited to the 24hr day beginning 0900 UTC.

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TEMPERATURES ETC.

Highest day maximum (date):... 13.3(07)

Highest 24hr maximum (date):.. 13.3(07)

Lowest night minimum (date):...-00.5(26)

Lowest 24hr minimum (date):...-00.5(26)

Lowest overnight grass minimum (date):...-03.1(14)

[ number of days grass minimum < 0degC: ... 07 ]

[ Lowest day maximum (date):... 03.8(26)]

[ Highest night minimum (date):... 11.0(10)]

A. Mean Day (09-18Z) maximum: ... 08.5

A. Mean Night (18-09Z) minimum: ... 04.3

A. Mean of Day Max & Night min: ... 06.4

B. Mean 24hr maximum:... 08.7

B. Mean 24hr minimum:... 03.5

B. Mean of 24hr max & min:... 06.1 [+1.9 anomaly on eLTA of 4.2degC]

(data below relate to 24 hr day beginning 09Z on date given)

Nr of days minimum at 09UTC <0.0degC:01[dates: 26]

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:

none)

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PRECIPITATION (PPN/mm)

Total rainfall/melted snow etc:... 26.6 [40% of eLTA of 66mm]

Highest 24hr total:............... 05.5(10)

No. days PPN total >= 0.2:13

No. days PPN total >= 1.0:10

No. days PPN total >=10.0:00

No. days PPN total >=25.0:00

(Notes relating to precipitation & allied observations:

1st: r(slight) from 1250Z, ocnl r after 15Z, csd by about 19Z, with pr for a short time ~20Z;

3rd: ir(slight) from mid-afternoon;

4th: a little rain ~0830Z; further light/intermittent rain from ~1410Z, with ocnl r 1650-1745Z, all PPN csd by 19Z;

5th: r(slight) from 1915Z, csd by 21Z;

6th: id(slight) from ~ 17Z, and off/on overnight 6th/7th;

7th/8th: ir(slight) from 07/1845-2015Z, then r(slight), ocnl r overnight;

8th: rkq (moderate rain/line-squall) 0710-0720Z, with further swiftly passing pr(slight) thereafter, dying out by midday;

9th: r(slight) from 1415Z, ocnl r, with further rain evening;

10th: r(slight) from about 0630Z, with dr/r(slight ocnl moderate) morning into afternoon, csd by ~16Z;

10th/11th: high dewfall overnight, but possible rain too - doubts;

11th: r(slight), ocnl r, from 1115Z-1730Z;

12th: light shower 1617-1625Z;

14th/15th: very light rain overnight;

15th: r(slight) late AM -> 13Z;

17th: r(slight) 0930Z, bec r 1525Z: csd by ~1615Z; pr(slight)/pr evening;

18th: pr early hours;

19th: ir(v.slight)~1345Z: r(slight) 1620Z, bec dr(slight)/r(slight), dying out evening;

21st: r(slight) early hours; very light rain ~2050/2100Z;

22nd: ir(slight) 1620, bec steady/light by 1640Z > rs(slight) ~2040Z, but generally remaining as rain until ceasing in early hours of 23rd;

24th: ps(very light) 0650-0700Z; couple of pr(very light) 12-15Z, with pr(slight), temporarily pr 1655-1720Z (=0.3mm);

24th/25th: ocnl dr(slight) overnight, with ir(slight) from 25/08Z, dying out by 10Z;

25th: r(slight) 21-22Z;

26th/27th: ir(slight)/pr(slight) overnight & morning;

27th: id/r(slight) 09-14Z, continuous slight thereafter, with ir 1715-1720Z;

27th/28th: further rain overnight, ocnl moderate, csd by ~0730Z;

28th: ir(slight) much of day, ocnl continuous, with pr(slight) ~1730Z;

29th: ir(slight) from early hours; pr(slight) much of morning; further dr(slight) rest of day, especially morning/early afternoon;

1st Feb: d(slight)/dr(slight) from 0645Z (credited to 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).. 00

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Additional comments on the weather in January, 2005

7th/8th: F5/6 overnight, increasing F6(7) by about 08/05Z, decreasing thereafter, but remaining blustery/squally;

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

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

Tn Tx Tg RR Tn Tx RR RR24hr Remark code (below)

(09Z) (09Z) (09Z)(18-09Z) (18Z) (18Z) (09-18Z) (from 09Z today)

01 05.9 08.6 02.4 - 08.1 11.5 00.8 01.7 -

02 03.0 10.7 01.2 00.9 03.4 06.6 - -

03 03.2 05.7 01.3 - 05.7 09.7 tr tr AB

04 08.6 09.7 07.7 tr 08.7 10.9 01.1 01.6 C

05 02.5 08.6 00.5 00.5 03.4 08.3 - 00.3

06 04.7 08.2 02.2 00.3 05.5 10.2 tr tr

07 10.2 12.2 09.7 tr 11.9 13.3 - 03.8 D

08 07.3 12.0 05.4 03.8 05.9 08.1 tr tr

09 05.4 07.3 04.0 - 07.2 10.9 00.6 01.0

10 11.0 12.4 10.4 00.4 09.2 11.4 05.3 05.5

11 06.8 09.1 04.9 00.2 09.1 12.1 01.7 01.7 E

12 05.3 11.4 03.7 - 05.4 08.6 tr tr

13 01.6 06.2 -00.9 - 02.1 07.0 - tr

14 00.0 03.4 -03.1 tr(X) 02.5 07.5 - 00.1 X=melted hoarfrost

15 05.6 07.6 04.4 00.1 06.9 08.8 tr tr

16 04.6 06.9 01.5 - 04.7 11.0 - - F

17 05.2 09.8 03.1 - 08.3 09.8 02.5 04.7

18 01.6 08.1 00.1 02.2 01.9 06.6 - - G

19 03.3 06.3 01.0 - 04.5 08.3 00.1 00.1

20 08.3 11.1 07.4 tr 10.9 12.1 - 00.1 HI

21 04.8 11.5 02.7 00.1 05.1 07.9 - tr

22 00.2 06.5 -02.6 tr 00.9 06.0 00.2 01.9

23 00.4 03.8 -01.6 01.7 00.6 04.6 - tr

24 01.1 03.2 -01.2 tr 01.4 04.6 00.3 00.3

25 01.2 02.8 -00.5 tr 03.0 05.0 tr 00.1

26 -00.5 03.2 -03.0 00.1 00.6 03.8 - tr J

27 02.0 05.0 00.0 tr 05.0 06.6 00.8 02.1 K

28 04.5 06.4 03.6 01.3 05.7 07.3 00.3 01.1

29 04.2 06.4 02.1 00.8 05.3 06.9 00.4 00.4 L

30 05.6 06.5 04.5 tr 05.9 07.8 - -

31 04.5 07.7 01.0 - 07.2 09.9 - 00.1 M

Remarks:

A. night max.(5.7) occurred 03/09Z

B. day min.(5.7), also 24hr min 4th, occurred 03/09Z

C. night max.(9.7), also equal with previous day max, occurred 04/09Z

D. night max.(12.2), also 24hr max 6th, occurred late in night 6th/7th

E. the 0.2mm of PPN overnight 10th/11th now thought to be dew – but small possibility of local rain

F. day min.(4.7), also 24hr min 17th, occurred morning 16th

G. day min.(1.9), also 24hr min 19th, occurred 18/09Z

H. night max.(11.1), also 24hr max 19th, occurred 20/09Z

I. the trace of PPN 19/18Z-20/09Z mix drizzle/condensation

J. day min.(0.6), also 24hr min 27th, occurred 26/09Z

K. night max.(5.0), also 24hr max 26th, occurred 27/09Z

L. day min.(5.3), also 24hr min 30th, occurred morning 29th

M. day min.(7.2), also 24hr min 1st Feb, occurred morning 31st

Number of occasions (24hr periods) THIS YEAR (2005)

maximum temperature >= 21degC (70degF) = 00

minimum temperature >= 16degC (61degF) = 00

Notes re: Rainfall anomaly

Looking at the period since September last (5 months), when water supplies for the coming 'summer-half' should be laid down, 4 of those months had rainfall significantly below average (<75%), and two months (September/41%) and January/40%) well below 50%.

The overall anomaly for these 5 months = 76%.

Notes re: Temperature anomaly

The rolling 12-month temperature anomaly (re: 1971-2000 dataset) is +0.9degC.