SUMMARY OF CLIMATOLOGICAL READINGS FOR 1999

Location: Tawfield, (Wooden Hill), Great Hollands, in the SW part of Bracknell.

( NGR: SU 854 667; Lat=51o 23' 30" North: Long=00o 46' 28" West )
Altitude 80 m
(temperatures 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.

Data JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
Highest maximum: xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x 16.6 12.3 xx.x
(dates): xx.x xxx xxx xxx xxx xxx xxx xxx xxx xxx 01 11 xxx
Lowest maximum: xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x 4.9 -0.6 xx.x
(dates): xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 18 19 xxx
Lowest minimum: xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x 1.0 -6.9 xx.x
(dates): xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 30 20 xxx
Highest minimum: xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x 11.3 8.4 xx.x
(dates): xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 01 07 xxx
Mean maximum: xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x 10.3 7.9 xx.x
Mean minimum: xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x 4.9 1.6 xx.x
Mean (max+min): xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x 7.6 4.7 xx.x
days min<0.0: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 00 09 xxx
(dates): xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx - 05,
14-16,
19-21,
29/30		 xxx
days max>=21.0: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 00 00 xxx
days max>=25.0: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 00 00 xxx
days max>=30.0: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 00 00 xxx
(dates): xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx - - xxx
Total rainfall etc: xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x 37.7 108.5 xx.x
Highest 24hr rainfall : xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x 8.9 15.7 xx.x
(dates): xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 05 24 xxx
days PPN >=0.2: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 21 24 xxx
days PPN >=1.0: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 11 19 xxx
days PPN >=10.0: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 00 03 xxx
days PPN >=25.0: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 00 00 xxx
days thunder heard: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 01 00 xxx
days hail <0.5cm: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 00 01 xxx
days hail >=0.5cm: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 01 00 xxx
days snow/rain&snow: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 00 04 xxx
days snow lying at 09UTC: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 00 03 xxx
deepest snow cover: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 00 04 xxx
(dates): xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx - 19,
21		 xxx
fog at 09UTC: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx 00 00 xxx

Notes on individual months:
January:
February:
March:
April:
May:
June:
July:
August:
September:
October:
November: Marked squall line with associated thunderstorm, hail etc., on afternoon of the 16th: No air frosts this month, but I have a feeling our site is a bit on the warm side.
December: 1. The 24hr maximum temperature credited to the following dates in fact occurred during the overnight period following: 02,05,10,16.
2. The lowest temperature of the month occurred over an 'icy' snow-cover on the morning of the 20th. Considerable transport problems with ice on roads/pavements etc.
3. 55.9mm, or 51% of the month's rainfall occurred over the 5 days 23rd to the 27th.
4. The snow that fell evening 18th into that night had a high water content, and for at least an hour, it melted quickly into the gauge so the usual relationship between snow-depth and eventual melted snow didn't hold good. 8.0mm recorded, but the depth only 4cm and that mostly over grass surfaces.
5. Although I do not have long-oeriod mean rainfall stats. for this location, estimating from adjacent records suggest my total represents some 190% of the 1961-90 average.

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