Weather review for February 2012

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  • Chesham, Bucks, from the air. Photo: Thomas Nugent, via www.geograph.org.uk/profile/4827

    Stonehenge in Wiltshire on Friday 10 February 2012. Photo: Chris Ison/PA Wire

    Stonehenge just a few days later on 16 February when the weather had turned much milder. Photo: Kirsty Wigglesworth/PA Wire

    Crocus flourishing in a Midlands garden, with temperatures up to 11 degrees Celsius above average on 23 February. Photo: David Jones/PA Wire

    The Church of St Peter and St Paul at Coleshill, Warwickshire. Photo: Mark Walton via www.geograph.org.uk/profile/11617

  • Weather review for February 2012
    29.02.2012 14:00

     

    The main features of the month were:

    * Coldest first half of the month since 1991

    *Warmest second half of the month since 1998

    * Minimum of minus -18.3°C at Chesham on the 11th was lowest in England in  February since 1986

    * Maximum of 18.7°C at Coleshill on the 23rd highest in England since 1998

     

    High pressure dominated to such an extent during February that it ended up the eighth most anticyclonic February in 140 years of records. Mean sea-level pressure ranged from 7mbar above normal in Shetland to 17mbar above in southwest Ireland and the Isles of Scilly. During the first 12 days of February a strong ridge of high pressure extended towards the UK from a Russian anticyclone, and as a result the weather during this periods was very cold indeed. Subsequently, highest pressure was often found close to southern Britain, so consequently from mid-month the weather became unusually mild.

    Mean maximum temperature for February ranged from 9.8°C at Murlough (Co Down) to 5.0°C at Thorncliffe (Staffs), while mean minimum temperature varied between 6.8°C at St Mary's (Isles of Scilly) and minus 1.2°C at Chesham (Bucks). Mean monthly temperature was 1.5-2.0degC above the 1981-2010 normal over much of Scotland and Northern Ireland, but around 1degC below in Southeast England. The Central England Temperature (CET) of 4.0°C was 0.5 degC below the long-term mean, colder than last February but warmer than that of 2010; in the last 100 years, 60 Februarys were warmer and 40 colder.

    The highest maximum at a standard site (i.e excluding rooftop and mountain sites) in the UK was 18.7°C at Coleshill (Warwicks) on the 23rd, while the lowest minimum was minus 18.3°C at Chesham (Bucks) early on the 11th. The lowest daytime maximum was minus 5.4°C at Coningsby (Lincs) on the 11th, and the warmest night was that of 22nd/23rd with a minimum of 12.2°C at Credenhill (Herefs).

    Rainfall averaged over England and Wales (including a very small estimated figure for the 29th) during February was 31mm which is 47 per cent of the average for the standard reference period 1981-2010, the lowest for this month since 1998;  in the last 100 years, 13 Februarys were drier while 87 were wetter. The equivalent figures for Scotland were 60mm and 88 per cent of the normal amount, and for Northern Ireland 46mm and 78 per cent.  Monthly totals at routinely-available sites varied between 310mm at Cluanie Inn (Wester Ross) and 6mm at Shoeburyness (Essex).

     Sunshine averaged over England and Wales (including a small estimated figure for the 29th) during February was 78 hours which is 93 per cent of the 1981-2010 mean; nevertheless this has been the sunniest February since that of 2008. In the last 100 years 36 Februarys were sunnier while 64 were duller. (Note, this may appear at odds with a below-average sunshine total; the reason is a sharp rise in the long-period mean in recent decades).  The equivalent figures for Scotland were 62 hours and 78 per cent, and for Northern Ireland 44 hours and 54 per cent.  Largest total in the UK was 103 hours at Southampton and the smallest was 34 hours at Tiree (Inner Hebrides).

    Strong winds were largely absent during February; there was no known instance of a gust in excess of 60 knots (69mph) at a low-level site during the month.

     

    Regional Breakdown

     

    Difference from the average (1981-2010)

    Mean Max

    (deg C)

    Mean Min

    (deg C)

    Rainfall

    (per cent)

    Sunshine

    (per cent)

     

     

     

     

     

    Scotland (Highlands and Islands)

    +1.0

    +1.8

    118

    68

     

     

     

     

     

    Scotland - Central Belt and east coast

    +1.3

    +1.9

    58

    85

     

     

     

     

     

    Northeast England

    +0.7

    +0.3

    36

    97

     

     

     

     

     

    East Anglia

    –0.3

    –0.9

    29

    117

     

     

     

     

     

    Midlands

    –0.4

    –0.4

    39

    103

     

     

     

     

     

    Southeast England

    –0.6

    –1.0

    37

    114

     

     

     

     

     

    Northwest England and North Wales

    +0.5

    +0.7

    84

    67

     

     

     

     

     

    Southwest England and South Wales

    –0.2

    –0.4

    52

    85

     

     

     

     

     

    Northern Ireland

    +0.9

    +2.3

    79

    54

     

     

     

     

     

    IrishRepublic

    +0.8

    +2.7

    68

    50

     

     

     

     

     

    ©Philip Eden 120229