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Denver +7ºC: July 39/23, Jan 15/-1, similar to St. George, Utah. Cza/Cra, a mostly desert landscape with some shrubs and grasses, similar to the real St. George. Tree line would be raised to ~4500m, beyond the highest peaks, which would be mostly forested except near the summits, where conditions would probably produce scattered krummholz.
Denver -7ºC: July 25/9, Jan 1/-15, can probably be found in the Rockies within 150km of Denver, around 2500m elevation in the current climatic conditions. Dfb, coniferous forest/open woodland. Tree line would be lowered to ~2500m, and glaciers would probably form on the slopes of the highest ranges, down to ~3800m.
The peak of the ice age was more than a 7ºC decrease from today on average, I think; the Denver area was tundra back then, and glaciers reached down to below 3000m.
Alamosa +7ºC: July 35/15, Jan 8/-10. Dra, still a desert landscape like the current Alamosa, with saguaros included perhaps?
Alamosa -7ºC: July 21/1, Jan -6/-24. Dzc, probably still nearly treeless, but the trees present are like those of the higher mountains, often stunted. "Alpine thistles" would be present as well.
Leadville +7ºC: July 30/12, Jan 6/-9. Dfb, similar to lower mountain elevations in the current conditions. Mixed coniferous forest and open woodland.
Leadville -7ºC: July 16/-2, Jan -8/-23. E, not far from glaciers (there are mountains nearby over 4000m). Grasses and mosses mainly, with some flowers. Snow may stay permanently in shaded locations. This is similar to the highest peaks, around 4000m in current conditions.
If the world is 7°C warmer, there will be more forests and grasslands and less deserts. You would expect deserts to expand but actually deserts will shrink. Ice caps and tundras will be covered with temperate forests, with the exception of a small part of antarctica which will be cold enough to sustain a taiga (boreal forest). The Sahara desert will heat so much in summer that it pushes the African monsoon much farther north. Most of Sahara will be tropical rainforest with some tropical monsoon forests and savannas. The cold currents causing desert climate in west coasts of South America and Africa will no longer be cold, so they will be covered with tropical rainforests. The central Asian deserts will mostly be short grass savannas. The center will retain some of the desert and the outer edges will be covered with tall grasslands savannas. Extreme outer edges will be covered with subtropical forests in the northern edges, and tropical rainforests and monsoon forests in the southern edges. Most of Antarctica will be covered with temperate forests, with some boreal forests. The center of the continent will be covered with grasslands, tall and short grass. Australia will be covered with tropical rainforests, tropical monsoon forests and grasslands in the most inland areas.
In this new world, the most common biomes arranged in descending order are:-
1. Tropical rainforests
2. Subtropical forests
3. Tropical monsoon forests.
4. Temperate forests.
5. Deserts
6. Boreal forests
With no tundras and ice caps.
Wouldn't there still be some tundras? The highest tree lines would be ~6000-6400m, so the Himalayas may still have some glaciers, as well as the Denali region and parts of Antarctica. Yes, there would be a lot less tundra if the world was 7ºC warmer; it would not be a major biome in terms of land area anymore.
A summer high of 92 F with our humidity levels would be disgusting. Detroit would feel like more like Memphis. Average high peaks at 85 F.
A temperature drop by 7 F would make my summers a whole lot more comfortable but the winters would be subarctic.
Don’t even get started on 7 degrees Celsius. Detroit would become Guangzhou if that ever happened.
BTW, I just realized something: in a world where every temperature were seven degrees hotter, Canada would have a really awkward climate: the likes of Toronto would be really hot in summer, and not warm enough in winter to make up for it, and while many of the northern towns/cities/hamlets would obviously be warmer in the summer, the winters would still be cold. (So a lot of northern Canada would probably have Winnipeg's climate.)
I just realized: I essentially gave Toronto an Oklahoman climate.
In a 7ºC warmer world New Zealand would resemble east coast Australia. Southern cities like Dunedin would be simillar to Sydeny while northern cities like Auckland would more closely resemble Brisbane. The vast majority of the country would be well moderated humid-subtropical, with some fully tropical climates in the Far North and some highland areas probably scraping into the Oceanic category. Percipitation would be the same or higher in most locations. Under this scenario New Zealand would probably have a larger population, at least double the size, due to increased agricultural yields, prehaps 12,000,000.
In a -7ºC cooler world New Zealand would essentially reseble southern Chile or Iceland/Norway. Southern cities like Dunedin would be simillar to ReykjavÃk, Iceland or Bodø, Norway. Northern cities like Auckland would more closely resemble Aberdeen, Scotland. The vast majority of the country would be well moderated subpolar-oceanic, with some fully oceanic climates in the Far North and most highland areas probably falling into the subarctic category. Perciptation would be quite a bit lower in this scenario with deserts east of the southern-alps, lower evaportransporation would help compensate for this lower rainfall however. Under this scenario New Zealand would probably have a much smaller population, at less than half the size, prehaps a low as 1,500,000.
In a 7ºC warmer world New Zealand would resemble east coast Australia. Southern cities like Dunedin would be simillar to Sydeny while northern cities like Auckland would more closely resemble Brisbane. The vast majority of the country would be well moderated humid-subtropical, with some fully tropical climates in the Far North and some highland areas probably scraping into the Oceanic category. Percipitation would be the same or higher in most locations. Under this scenario New Zealand would probably have a larger population, at least double the size, due to increased agricultural yields, prehaps 12,000,000.
In a -7ºC cooler world New Zealand would essentially reseble southern Chile or Iceland/Norway. Southern cities like Dunedin would be simillar to ReykjavÃk, Iceland or Bodø, Norway. Northern cities like Auckland would more closely resemble Aberdeen, Scotland. The vast majority of the country would be well moderated subpolar-oceanic, with some fully oceanic climates in the Far North and most highland areas probably falling into the subarctic category. Perciptation would be quite a bit lower in this scenario with deserts east of the southern-alps, lower evaportransporation would help compensate for this lower rainfall however. Under this scenario New Zealand would probably have a much smaller population, at less than half the size, prehaps a low as 1,500,000.
Oh, and if Australia were 7 degrees hotter, even less people would be living in it, and the biggest settlement there would be in or around one of those Australian ski resorts.
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