February. England is also sunnier throughout the year, but unlike Wales, Northern Ireland and Scotland, the sunniest month is July, totalling around 192.8 hours. The highest temperature recorded in England is 38.7 °C (101.7 °F) on 25 July 2019 at Cambridge University Botanic Garden. The lowest temperature recorded in England is −26.1 °C (−15.0 °F) on 10 January 1982 at Edgmond, near Shropshire. The climate of south-west England is rather distinct and somewhat milder than the rest of England, forming its own separate climate. Crops, flowers and plants can be grown much earlier in the south-west than in the rest of England and the UK. England mainly lies within hardiness zone 8, but the Pennines and Cumbrian Mountains lie in the colder zone 7 and south west England, the Irish sea coast, South coast and London lie in the warmer zone 9. A very small area, the Isles of Scilly lie in the warmest zone in the British Isles, zone 10 which is close to Sub-Tropical. Geology The Geology of England is mainly sedimentary. The youngest rocks are in the south east, progressing in age in a north-westerly direction. The Tees–Exe line marks the division between younger, softer and low-lying rocks in the south east and older, harder, and generally a higher relief in the north-west. The geology of England is recognisable in the landscape of its counties, for instance Cumbria, Kent and Norfolk all have very distinct and very different looks from each other. The geology of Northern England and Western England tends to be somewhat closer to that of its near neighbours, Wales and Scotland, with the geology of Southern England and Eastern England being more aligned with that found across the North Sea and English Channel in Northern France, Belgium, and the Netherlands. Geological features: Cheddar Gorge – the largest gorge in Great Britain Jurassic Coast – a UNESCO World Heritage Site Salisbury Plain Tees–Exe line Whin Sill London Basin Hampshire Basin London-Brabant Massif Dartmoor – one of a series of moors in the South West of England developing tors on a granitic batholith Lizard Complex – an ancient piece of oceanic crust, onshore (i.e. an Ophiolite). Geological resources: Coal North Sea oil Sand and Gravel China Clay Copper and Tin Stone North Sea gas Potash and less abundantly, Geothermal energy Onshore oil Major towns and cities London is, by far, the largest urban area in England