September 2011 was a changeable month redeemed by a spectacularly warm and sunny ending. For most of the month low pressure and southwesterly winds dominated; it was the sixth most south-westerly September in 139 years of records.
The average maximum temperature ranged from 21.8°C at Swanscombe (Kent) to 13.3°C at Fair Isle (between Orkney and Shetland), while the average minimum temperature varied between 14.8°C at St Catherine's Point (Isle of Wight) and 8.0°C at Braemar (Aberdeenshire). Daytime readings ranged from 2 °C above normal in the Midlands and East Anglia to near normal in western Scotland, while night-time temperatures were 1-2 °C above in all regions. The Central England Temperature (CET) of 15.2°C was 1.5 °C above the long-term mean making this the warmest September since 2006.
The highest individual maximum in the UK was 29.2°C at Sutton Bonington (Notts) on the 30th, while the lowest minimum was minus 0.4°C at Tyndrum (Stirlingshire) early on the 15th. The lowest daytime maximum was 9.6°C at Lerwick (Shetland) on the 15th, and the warmest night was that of the 9th/10th with a minimum of 18.1°C at Olympic Park (London).
Rainfall averaged over England and Wales during September was 57mm which is 69 per cent of the average for the standard reference period 1971-2000, the lowest for just two years; in the last 100 years 66 Septembers were wetter while 34 were drier. The equivalent figures for Scotland were 112mm and 129 per cent of the normal amount, and for Northern Ireland 94mm and 115 per cent. Monthly totals ranged from 529mm at Cluanie Inn (Wester Ross) to 9mm at Cranwell (Lincolnshire).
Sunshine averaged over England and Wales during September was 155 hours which is 108 per cent of the 1971-2000 mean and higher than the figure for August. In the last 100 years 41 Septembers were sunnier while 59 were duller. The equivalent figures for Scotland were 115 hours and 108 per cent, and for Northern Ireland 121 hours and 107 per cent. Largest total in the UK was 197 hours at Thorney Island (West Sussex) and the smallest was 41 hours at Kinlochewe (Wester Ross).
The windiest day of the month was the 12th when ex-hurricane "Katia" crossed Scotland, with a peak gust of 70 knots at Capel Curig (Caernarvon).
© Philip Eden
Source: http://feeds.weatheronline.co.uk/~r/weatheronline/~3/aEYvBEo277Q/reports
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