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I'm not sure why there is a zone 9 area around Birmingham, when that region actually records some quite cold temps. Also, the zone 9 is too far east around London; it should extend west a bit to include Heathrow and parts of Surrey/Berkshire.
But don't forget USDA zones are worked out from an average of absolute minimums over a 30 year period & Birmingham does actually have an UHI. Heathrow also records some pretty cold temperatures from time to time, didn't it drop to -8C last winter? And some of the coldest winter weather can come from the east, so areas to the east of London will actually not be as cold as areas to the west in that set up. Also the map may look odd as UK maps normally split each zones into a & b. It isn't exact but it is one of the most accurate I have seen for Europe as a whole...
I'd actually expect Liverpool and even Manchester to have a higher hardiness zone than Birmingham. Birmingham is consistently one of the highest cities in the UK in terms of elevation - a record low of -21C at Birmingham Airport and -13C at Edgbaston.
But don't forget USDA zones are worked out from an average of absolute minimums over a 30 year period & Birmingham does actually have an UHI. Heathrow also records some pretty cold temperatures from time to time, didn't it drop to -8C last winter? And some of the coldest winter weather can come from the east, so areas to the east of London will actually not be as cold as areas to the west in that set up. Also the map may look odd as UK maps normally split each zones into a & b. It isn't exact but it is one of the most accurate I have seen for Europe as a whole...
I know that, but Heathrow's annual absolute minimum temperature for the 81-10 period is -5.2c, which puts it in 9a. That area around Birmingham doesn't correspond to the UHI, it's a much larger area.
I know it isn't exact & it can't have such great detail as a UK zone map would have, but like as said for Europe as a whole it is pretty good...
Someone (who has more time than me) should work out the absolute average annual minimums for the larger cities in the UK, I know many don't actually have weather stations in the city themselves, but it would be good to get an idea of what zones each place actually are in so a more accurate UK map could be made... I did Southsea's ages ago & for there it was -3.4C which works out at 9b...
I worked out the average annual minimum for Linton-On-Ouse as -7.3C, from the last 20 years of available data. The warmest annual low was -4.6C, and the coldest was -17C. No idea about York itself, but it's obviously going to be a bit warmer.
The same day Linton recorded -17C, The University of York recorded -12.6C.
I worked out the average annual minimum for Linton-On-Ouse as -7.3C, from the last 20 years of available data. The warmest annual low was -4.6C, and the coldest was -17C.
Yeah, sounds about right. I imagine Church Fenton is similar. Leeds city centre has a very pronounced UHI.
Climate question? According to this confusingly labelled map, most of England not on the coast is zone 8, while coastal Mediterranean France except for Nice is zone 9. Does that look right to you?
My deutsch is a bit rusted. Is it the average range of the coldest temperature in a given year ? I'd say for France it seems quite accurate
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