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Temperatures for all countries/dependencies after 31/12/2020 are estimated from non-quality controlled SYNOP data (12 hour max reported at 18Z, and 12 hour min reported at 06Z). Temperatures on or before this date are available for the UK only, and come from the quality controlled, official MIDAS Open dataset, courtesy of NCIC.
*Sites below 500m only

Maximum (06Z D to 18Z D, °C)
Highest38.0°C 19th March, (Lerwick, 82m)
Lowest8.0°C 8th February, (Scilly: St Marys Airport, 31m)
Minimum (18Z D-1 to 06Z D, °C)
Lowest-18.7°C 11th January, (Altnaharra No 2, 81m)
Highest4.6°C 24th February, (Killylane, 250m)
Maximum (06Z D to 18Z D, °C)
Lerwick (82m)38.019th March
Wiggonholt (28m)29.413th January
High Beach (110m)29.19th January
Northolt (40m)24.012th April
London, St James's Park (13m)23.211th April
Shoreham Airport (13m)23.04th April
Aboyne No 2 (140m)22.710th April
Lossiemouth (6m)22.12nd April
Northolt (40m)21.320th March
Castlederg (49m)21.29th April
Hurn (10m)20.85th April
St Bees Head No 2 (124m)20.58th April
Pembrey Sands (3m)20.13rd April
Aviemore (228m)20.07th April
Culdrose (78m)20.022nd January
Myerscough (14m)19.927th March
Crosby (9m)19.79th March
Kinlochewe (25m)19.721st March
Teddington, Bushy Park (m)19.76th March
Kinloss (5m)19.61st April
Cavendish (55m)19.426th March
Aboyne No 2 (140m)19.231st March
London, St James's Park (13m)19.226th April
Bridgefoot (49m)19.18th March
Hurn (10m)19.06th April
Weybourne (21m)18.87th March
Cranwell (62m)18.714th April
Southampton, Oceanography Centre (m)18.725th March
Whitechurch (129m)18.622nd March
Heathrow (25m)18.517th April
Aultbea No 2 (11m)18.425th April
Aultbea No 2 (11m)18.324th April
Prestwick, Gannet (27m)18.223rd April
Shoreham Airport (13m)18.219th April
Heathrow (25m)18.122nd April
London, St James's Park (13m)18.130th March
Manston (49m)18.113th April
Holbeach No 2 (3m)17.818th April
Trawsgoed (63m)17.620th April
Wiggonholt (28m)17.610th March
Plymouth, Mountbatten (50m)17.121st April
Camborne (87m)17.04th March
Heathrow (25m)17.015th April
Hull, East Park (2m)17.021st February
Exeter Surfacenet Enclosure Aws (45m)16.823rd March
Killowen (4m)16.824th March
Santon Downham (6m)16.55th March
Frittenden (38m)16.428th March
Kinloss (5m)16.420th February
Northolt (40m)16.016th April
Aboyne No 2 (140m)15.715th January
Kew Gardens (6m)15.524th February
Almondsbury (75m)15.15th February
London, St James's Park (13m)15.129th March
Southampton, Oceanography Centre (m)15.022nd February
Dunstaffnage (3m)14.918th March
Woburn (89m)14.617th March
Chivenor (6m)14.519th February
Okehampton, East Okement Farm (408m)14.516th January
Fyvie Castle (55m)14.42nd March
Tain Range (4m)14.417th January
Cassley (99m)14.214th January
Holbeach No 2 (3m)14.28th January
Lossiemouth (6m)14.123rd February
Exeter Airport No 2 (27m)13.95th January
Kew Gardens (6m)13.93rd March
Usk No 2 (25m)13.511th March
Kinlochewe (25m)13.33rd February
Killowen (4m)13.215th March
Santon Downham (6m)13.21st January
Scilly: St Marys Airport (31m)13.214th February
Swanage (10m)13.025th February
Plymouth, Mountbatten (50m)12.828th February
Preston, Moor Park (33m)12.712th March
Kinloss (5m)12.66th February
Aultbea No 2 (11m)12.51st February
Frittenden (38m)12.46th January
Cardiff, Bute Park (9m)12.327th February
Helens Bay (43m)12.316th March
Kinloss (5m)12.34th February
Armagh (62m)12.221st January
Usk No 2 (25m)12.21st March
Scilly: St Marys Airport (31m)12.119th January
Rochdale (110m)12.029th January
Scilly: St Marys Airport (31m)11.926th January
Coventry, Coundon (119m)11.831st January
Exeter Airport No 2 (27m)11.724th January
Gogerddan (31m)11.710th February
Scilly: St Marys Airport (31m)11.712th January
Scilly: St Marys Airport (31m)11.715th February
Threave (73m)11.720th January
Usk No 2 (25m)11.528th January
Nantwich, Reaseheath Hall (40m)11.426th February
Derrylin, Cornahoule (68m)11.318th January
Scilly: St Marys Airport (31m)11.311th January
Culdrose (78m)11.22nd February
Magilligan No 2 (6m)11.22nd January
Mona (62m)11.218th February
Scilly: St Marys Airport (31m)10.923rd January
Walney Island (15m)10.914th March
Armagh (62m)10.713th March
Aultbea No 2 (11m)10.77th February
Scilly: St Marys Airport (31m)10.727th January
Kenley Airfield (170m)10.67th January
Scilly: St Marys Airport (31m)10.617th February
Cardiff, Bute Park (9m)10.530th January
Scilly: St Marys Airport (31m)10.525th January
Nantwich, Reaseheath Hall (40m)9.913th February
Scilly: St Marys Airport (31m)9.916th February
Scilly: St Marys Airport (31m)9.710th January
Scilly: St Marys Airport (31m)9.712th February
Scilly: St Marys Airport (31m)9.04th January
Santon Downham (6m)8.99th February
Scilly: St Marys Airport (31m)8.711th February
Chivenor (6m)8.23rd January
Scilly: St Marys Airport (31m)8.08th February
Minimum (18Z D-1 to 06Z D, °C)
Altnaharra No 2 (81m)-18.711th January
Kinbrace, Hatchery (103m)-13.812th January
Loch Glascarnoch (265m)-13.36th January
Tulloch Bridge (237m)-12.49th January
Altnaharra No 2 (81m)-12.110th January
Loch Glascarnoch (265m)-11.05th January
Aviemore (228m)-9.314th February
Aboyne No 2 (140m)-8.64th January
Altnaharra No 2 (81m)-8.69th February
Aboyne No 2 (140m)-8.319th March
Benson (57m)-7.93rd January
Braemar No 2 (327m)-7.920th March
Aboyne No 2 (140m)-7.718th March
Aboyne No 2 (140m)-7.67th February
Altnaharra No 2 (81m)-7.610th February
Aviemore (228m)-7.513th February
Benson (57m)-7.316th March
Tulloch Bridge (237m)-7.08th January
Shap (255m)-6.915th March
Aboyne No 2 (140m)-6.820th January
Aviemore (228m)-6.88th February
Altnaharra No 2 (81m)-6.617th March
Fyvie Castle (55m)-6.522nd January
Altnaharra No 2 (81m)-6.315th February
Shap (255m)-6.32nd January
Benson (57m)-6.13rd March
Aboyne No 2 (140m)-5.819th January
Topcliffe (25m)-5.86th February
Aboyne No 2 (140m)-5.528th February
Altnaharra No 2 (81m)-5.58th April
Benson (57m)-5.414th March
Sennybridge No 2 (307m)-5.42nd March
Woburn (89m)-5.417th February
Benson (57m)-5.34th March
Topcliffe (25m)-5.37th January
Balmoral (283m)-5.223rd January
South Newington (105m)-5.21st March
Aboyne No 2 (140m)-5.11st February
Altnaharra No 2 (81m)-5.16th April
Sennybridge No 2 (307m)-5.012th March
Topcliffe (25m)-5.030th January
Altnaharra No 2 (81m)-4.916th April
Charlwood (67m)-4.95th March
Altnaharra No 2 (81m)-4.83rd April
Altnaharra No 2 (81m)-4.87th April
Altnaharra No 2 (81m)-4.818th April
Aboyne No 2 (140m)-4.531st January
Katesbridge (91m)-4.513th March
Santon Downham (6m)-4.53rd February
Kinbrace, Hatchery (103m)-4.427th February
Aboyne No 2 (140m)-4.326th February
Altnaharra No 2 (81m)-4.35th April
Braemar No 2 (327m)-4.221st March
East Malling (33m)-4.22nd February
Woburn (89m)-4.218th February
Shawbury (72m)-4.116th January
Santon Downham (6m)-3.926th January
Altnaharra No 2 (81m)-3.812th April
Redesdale Camp (211m)-3.79th April
Balmoral (283m)-3.621st January
Aboyne No 2 (140m)-3.54th April
Benson (57m)-3.529th March
Redesdale Camp (211m)-3.410th April
Shap (255m)-3.42nd April
Katesbridge (91m)-3.324th March
South Newington (105m)-3.213th January
South Newington (105m)-3.16th March
Aboyne No 2 (140m)-2.924th January
Islay: Port Ellen (17m)-2.611th March
Aboyne No 2 (140m)-2.426th March
Shap (255m)-2.410th March
Redesdale Camp (211m)-2.314th April
Loch Glascarnoch (265m)-2.215th April
Shobdon Airfield (99m)-2.217th January
South Newington (105m)-2.119th February
Frittenden (38m)-2.014th January
Hawarden Airport (14m)-2.018th January
Shobdon Airfield (99m)-2.025th January
Benson (57m)-1.917th April
Tulloch Bridge (237m)-1.923rd April
Aboyne No 2 (140m)-1.85th February
Lentran (146m)-1.716th February
Topcliffe (25m)-1.631st March
Hurn (10m)-1.511th April
Cardinham, Bodmin (200m)-1.311th February
Santon Downham (6m)-1.327th March
Katesbridge (91m)-1.229th January
Santon Downham (6m)-1.225th March
Altnaharra No 2 (81m)-1.121st April
Drumnadrochit (53m)-1.127th January
Aboyne No 2 (140m)-1.09th March
Leconfield (7m)-1.01st April
Topcliffe (25m)-1.015th January
Tulloch Bridge (237m)-1.028th January
Topcliffe (25m)-0.925th February
South Newington (105m)-0.74th February
Loch Glascarnoch (265m)-0.625th April
Aboyne No 2 (140m)-0.522nd April
Loch Glascarnoch (265m)-0.524th April
Baltasound No 2 (15m)-0.38th March
Fyvie Castle (55m)0.123rd February
Bude (15m)0.412th February
Kinbrace, Hatchery (103m)0.61st January
Redesdale Camp (211m)0.826th April
Shap (255m)0.820th April
Castlederg (49m)1.313th April
Redesdale Camp (211m)1.420th February
Tain Range (4m)1.47th March
Aboyne No 2 (140m)1.528th March
Charlwood (67m)2.127th April
Shobdon Airfield (99m)2.422nd February
Redesdale Camp (211m)3.023rd March
Baltasound No 2 (15m)3.219th April
Fyvie Castle (55m)3.222nd March
Lerwick (82m)4.030th March
Resallach (133m)4.021st February
Killylane (250m)4.624th February