January opened with a few days of anticyclonic weather, followed by a week of cyclonic conditions and then a week of southwesterlies. The second half of the month was mainly anticyclonic. Rain fell frequently and sometimes heavily between the 7th and 17th, but amounts of rain during the remainder of the month were generally small. Apart from a very mild spell between the 12th and 16th, the weather was mostly rather cold.
Mean maximum temperature for January ranged from 8.9°C at St Mary's (Isles of Scilly) to 3.5°C at Dalwhinnie (Inverness-shire) and Carter Bar (Roxburghshire), while mean minimum temperature varied between 6.3°C at St Mary's and minus 1.7°C at Braemar (Aberdeenshire). Both mean maximum and mean minimum temperatures were 0.0-1.0°C above normal in the eastern half of England, but 0.0-1.0°C below in all other parts of the UK. The Central England Temperature (CET) of 3.7°C was 0.5°C below the long-term mean, nevertheless it was higher than during the last two Januarys.
The highest maximum at a standard site (i.e excluding rooftop and mountain sites) in the UK was 14.5°C at Pershore (Worcs) on the 13th, while the lowest minimum was minus 13.0°C at Altnaharra (Sutherland) early on the 8th. The lowest daytime maximum was minus 3.9°C at Strathallan (Perthshire) on the 7th, and the warmest nights were those of the 12th/13th and 15th/16th with a minimum of 11.8°C at Exeter (Devon) and Linton-on-Ouse (N.Yorks) respectively.
Rainfall averaged over England and Wales was 82mm which is 88 per cent of the average for the standard reference period 1971-2000, rather higher than January 2010 but slightly lower than January 2009; in the last 100 years 36 Januarys were drier while 64 were wetter. The equivalent figures for Scotland were 93mm and 92 per cent of the normal amount, and for Northern Ireland 51mm and 54 per cent. Monthly totals at routinely-available sites ranged from 351mm at Inveruglas (Dunbartonshire) to 14.6mm at Dishforth (N.Yorks).
Sunshine averaged over England and Wales during January was 57 hours which is 104 per cent of the 1971-2000 mean. The equivalent figures for Scotland were 55 hours and 131 per cent, and for Northern Ireland 77 hours and 159 per cent. Largest total in the UK was 89 hours at Culdrose (Cornwall) although Cork airport in the Irish Republic recorded 94 hours, and the smallest was just 30 hours at Lerwick (Shetland).
It was another quiet month with few gales. The windiest days of the month were the 15th and 16th with gusts to 66kn at Capel Curig (Caernarfon).
Snow from December's falls remained on the ground in upland parts of Scotland and northern England until the 12th or 13th. Amounts of fresh snow at low levels during January were generally small.
© Philip Eden
Source: http://feeds.weatheronline.co.uk/~r/weatheronline/~3/ouy-Nnpe-Vs/reports
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