Summary for June, 2006

======================

HEADLINE: VERY DRY. THREE HOT SPELLS. COLD/WET DAY 26TH, THEN WARM END.

(last updated: 01/1200 JULY)

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; )

=================================

TEMPERATURES ETC.

Highest day maximum (date):... 31.5(12)

Highest 24hr maximum (date):.. 31.5(12)

Lowest night minimum (date):... 05.1(01)

Lowest 24hr minimum (date):... 05.1(01)

Lowest overnight grass minimum (date):... 02.8(01)

[ number of days grass minimum < 0degC: ... 00 ]

[ Lowest day maximum (date):... 14.0(26)]

[ Highest night minimum (date):... 17.3(11)]

A. Mean Day (09-18Z) maximum: ... 23.5

A. Mean Night (18-09Z) minimum: ... 12.1

A. Mean of Day Max & Night min: ... 17.8

B. Mean 24hr maximum:... 23.5 [+3.4 anomaly on eLTA of 20.1degC]

B. Mean 24hr minimum:... 12.1 [+1.5 anomaly on eLTA of 10.6degC]

B. Mean of 24hr max & min:... 17.8 [+2.5 anomaly on eLTA of 15.3degC]

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

Nr of days minimum at 09UTC <0.0degC:00

Nr of days maximum at 09UTC >=21degC:22

Nr of days maximum at 09UTC >=25degC:12

Nr of days maximum at 09UTC >=30degC:01[dates: 12]

(Notes relating to temperature & allied observations:

26th: the 24hr maximum of 14.3 is the lowest value for June in our 7 year record, and is particularly notable for occurring near the end of the month.)

=================================

PRECIPITATION (PPN/mm)

Total rainfall/melted snow etc:... 15.4 [28% of eLTA of 55mm]

Highest 24hr total:............... 08.9(26)

No. days PPN total >= 0.2:06

No. days PPN total >= 1.0:05

No. days PPN total >=10.0:00

No. days PPN total >=25.0:00

(Notes relating to precipitation & allied observations:

1st: ir(very light) morning;

4th: pr(few drops) 1645-1745Z from unstable medium-level cloud, & also between 18 & 19Z;

7th: pr(slight/few drops) 1650-1705Z, 1755-1805Z, then tl(slight / var. cells distant & overhead) until 1845Z, with very brief period moderate rain ~1815Z;

13th: r(slight) 0330-0430Z, enough to put a measured 'trace' in gauge, but evaporated-off readily from all surfaces [edge of heavy rain to east]; r(slight), short-period r 1340-1510Z; r(slight)/r ~1615Z & 1725Z & again early evening, this latter only slight/non-significant (SEE OTHER NOTES BELOW);

19th: pr(very few drops)~0720Z

21st: ir(slight)/r(slight) from early hours - ~0330Z, with short burst r ~0245Z;

24th: r(slight) off & on from early hours to ~0645Z, with short period r ~0400Z;

25th: r(slight)/r 1430-1520Z;

26th: r(slight), ocnl r, 05-0730Z, r(slight) 0850Z-11Z, r(slight)/r(R) 1230-1630Z, further ir(slight) from ~1745-19Z.

27th: r(slight), ocnl r, 01-05Z; )

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OTHER TOTALS

Number of days thunder heard: (dates).. 01 (07)

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

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

Number of days snow/rain & snow:....... 00

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

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

Number of days fog (visibility < 1km @ 09UTC).. 00

=================================

Additional comments on the weather in June, 2006

4th: NLC (seen diffusely through dense Ci) to NE~0200Z;

13th: significant rainfall occurred this day to the north and just to the east, but as you can see, we missed out on the 'double-figure' rainfall totals that others recorded; specifically, I have heard of a fall of rain of over 20 mm within 30 mins at Winkfield (about 10 km to the north of us) that occurred ~1500Z, with a single rumble of thunder heard there.

23rd: NLC seen ~0050Z (Type I & IIa/brightness=2)

[thunder]

7th: tl(slight / various cells distant & overhead) 1805Z - 1845Z, with very brief period moderate rain ~1815Z, otherwise light rain: thunder infrequent, no local CG discharges detected;

[snow]

NIL.

... 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 05.1 15.0 02.8 - 12.5 16.7 tr tr -

02 08.2 16.3 05.6 - 16.1 21.0 - -

03 08.4 19.6 06.9 - 18.3 24.4 - -

04 09.3 22.7 07.7 - 17.8 24.2 tr tr

05 12.3 21.6 10.2 tr 16.8 19.9 - -

06 08.3 18.6 06.5 - 16.3 21.6 - -

07 10.9 20.3 (08.0) - 18.4 26.9 tr 00.5 A

08 13.1 25.4 11.4 00.5 22.2 26.9 - -

09 13.7 24.7 11.0 - 22.2 26.5 - -

10 14.0 24.6 12.4 - 23.7 28.9 - -

11 17.3 26.9 (16.0) - 23.7 26.9 - - B

12 17.2 25.8 14.7 - 24.2 31.5 - tr

13 16.1 26.2 14.1 tr 17.8 24.4 01.4 01.4

14 14.6 17.8 14.5 tr 15.4 18.5 - -

15 10.3 17.8 09.1 - 14.9 22.4 - -

16 10.7 19.9 09.5 - 19.9 25.0 - - C

17 14.5 23.9 12.0 - 23.9 28.3 - -

18 14.0 26.4 11.7 - 21.1 25.1 - tr

19 14.9 21.7 14.1 tr 18.2 20.2 - -

20 13.6 19.9 12.0 - 17.6 22.4 - 01.4

21 13.6 17.6 13.1 01.4 16.7 20.1 - -

22 09.8 17.2 08.9 - 15.8 20.5 - -

23 09.0 17.9 07.6 - 16.5 22.6 - 01.2

24 12.8 21.5 12.0 01.2 16.5 25.4 - -

25 11.2 24.1 08.6 - 18.6 23.7 01.0 02.0

26 13.1 18.8 12.2 01.0 13.4 14.0 08.1 08.9

27 10.8 14.3 10.6 00.8 14.3 18.9 - - D

28 12.7 18.7 10.9 - 17.4 22.5 - -

29 11.5 20.8 09.5 - 18.9 25.9 - -

30 11.8 24.3 09.9 - 21.8 28.5 - -

Readings taken at 0900 and 1800 UTC. Where the NIGHT maximum or DAY minimum are significantly different from 24hr values, this will be noted in the listing against a 'Remarks' letter. There are two mean 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) .. 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.

Remarks:

A. grass min. index stuck – reasonable estimate made based on 0445Z reading;

B. this reading is around the area where my grass min. gets stuck! Looks OK, but not absolutely sure;

C. [ Screen washed 0930-1000Z: a lot of pollen, but otherwise condition good.]

D. night max.(14.3), also 24hr max. 26th, occurred 27/09Z

Number of occasions (24hr periods) THIS YEAR (2006)

maximum temperature >= 21degC (70degF) = 27

minimum temperature >= 16degC (61degF) = 03

Rolling 12 month temperature anomaly: +0.5 (was +0.5 end last month)

Rolling 12 month rainfall anomaly: 93% (was 95% end last month)

Rolling 24 month rainfall anomaly: 85% (was 86% end last month)

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Total rainfall for this year (2006) so far: 280 mm, representing 86% of the 'average' that we should have by the end of June (327mm).

NOTES RE: PERIODS WITH MAXIMA >=25DEGC FOR THREE OR MORE DAYS (FOR ME, A 'HOT' SPELL).

(RECORD STARTS: 1999)

[DATA FOR SOME PERIODS APPROXIMATE DUE TO POOR EQUIPMENT AVAILABLE]

[1999]

06JUN-13JUN (8 DAYS): 26,25,27,25½,26½,28,25,25

17JUL-19JUL (3 DAYS): 26,29½,25½

23JUL-25JUL (3 DAYS): 26½,29½,28½

28JUL-07AUG (11DAYS): 25½,28½,30½,33,31½,32,25,26½,25½,26½,26½

01SEP-06SEP (6 DAYS): 25½,26,26,26½,28,26½

[2000]

17JUN-19JUN (3 DAYS): 26.9,30.9,30.0

18JUL-21JUL (4 DAYS): 26.2,25.8,25.0,26.0

10AUG-12AUG (3 DAYS): 25.0,25.6,27.1

[2001]

11MAY-13MAY (3 DAYS): 26.1,25.2,25.3

24JUN-26JUN (3 DAYS): 28.3,29.6,32.2

01JUL-06JUL (6 DAYS): 25.6,27.5,29.6,29.2,28.5,25.9

25JUL-01AUG (8 DAYS): 26.0,28.1,29.4,29.9,30.6,29.2,26.7,26.9

13AUG-15AUG (3 DAYS): 26.1,27.2,28.1

[2002]

14JUL-16JUL (3 DAYS): 25.6,25.7,26.1

26JUL-30JUL (5 DAYS): 27.6,25.1,29.7,31.2.25.0

13AUG-18AUG (6 DAYS): 25,26½,28½,27,29,26

[2003]

29MAY-31MAY (3 DAYS): 26½,28,28½

14JUN-17JUN (4 DAYS): 25½,27,28½,26½

08JUL-15JUL (8 DAYS): 25½,29½,29,25,28½,30½,31,34

02AUG-13AUG (12DAYS):25½,30,31.3,31.3,33.6,29.4,30.2,33.9,35.6,32.7,28.0,27.6

[2004]

13JUN-16JUN (4 DAYS): 25.0,29.0,27.2,27.2

28JUL-08AUG

(12DAYS):26.8,28.8,25.7,28.2,26.8,28.2,28.0,29.6,28.2,27.9,29.2,29.9

[2005]

17JUN-23JUN (7 DAYS): 25.5,29.4,31.8,27.7,26.0,29.6,30.3

10JUL-15JUL (6 DAYS): 28.9,27.7,27.8,30.6,30.5,28.0

29AUG-31AUG (3 DAYS): 25.0,25.9,29.0

[2006/INCOMPLETE]

07JUN-12JUN (6 DAYS): 26.9,26.9,26.5,28.9,26.9,31.5

16JUN-18JUN (3 DAYS): 25.0,28.3,25.1

[RAINFALL]

> Third notably dry June in a row (2004=47%, 2005=54%, 2006=28%).

> Driest June since 1996 locally, which month was the last in a series of five 'drier-than-average' Junes.

> Driest 'any-month' since September, 2003.

> In a composite local series from 1971-current, June 2006 is in the 'top-5' of driest such-named months. The driest was 1976, followed by 1996.

> However, note that on the 13th, some short-period, high-intensity rainfall was experienced locally, up to 25mm in places not very far away to the north & east (1 - 2 km away), and thus our very low figure should be seen in that context. It could so easily have been 35mm total for the month, rather than 15mm.

[DRY JUNES SINCE 1971]

1. 9.8 mm 1976

2. 11.2 mm 1996

3. 11.9 mm 1975

4. 12.2 mm 1995

(5. 15.4 mm 2006 . . notional BEP: 14.8 mm)

6. 17.6 mm 2000

[TEMPERATURES]

Using the best climatology I can muster for the immediate local area, by the 24hr mean temperature, it looks as if this June has been the warmest since 1976, and runs second to that record month (in a composite series beginning 1971). The anomaly was heavily biased towards the 24hr maxima as can be seen by the above figures. With the ground very dry for the greater part of the month, insolation had maximum effect on low-level temperatures by day.