Well like I said that's still the temperature where you paint it. The polar gradient really only says how much heat is added to it in Summer.
To actually work it out wouldn't be a lot of work. You can make the painted temperature constant for a whole vertical row of the world easily enough and then just embark with some goof off settings- like invasions off, 1000 fps max, all the points put into food/drink, etc. Just check the seasons and read your little thermometer close enough to see the min and max. I can already tell you that the peak temperature increases straight up linearly- no curves to worry about.
I think that Toady could do enough for our temperature woes by allowing us to make a world where both edges were frozen and the equator was actually in the middle. Then again a lot of people think he could make things easier with an init option for no aquifers but he's into keeping the geology as realistic as he can manage.
People that program simulations making them simulate things! Who'd have guessed?
The problem with flat out removing the seasonal variation though, is that with none EVERYTHING cold enough to freeze water would be tundra with BAM! green fields and flowing water right next to it. You can do that with world painter if you're willing to make things ludicrously cold but I think there would be at least as many complaints about how people couldn't use the option (and thus this program) and still get seasonal Winters.
Or he could strip this thing off and custom tailor something something that would make it play nicer with painters. If you want that though you'd going to need to put it in the voting thread, get people to actually say they want it the most, look legitimate, and then wait for Toady to get to it anyway.
MAN! Why didn't he do all these new things we want before? I'm sure after all of these years if he'd just typed a little faster it would add up to these things we constantly cry out for...
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ANYWAY the way these generation profiles work people can actually get your program to paint their temperature. They just need to save another one with something else, like maybe rainfall, and then copy and paste that onto the end of the world with everything else set up how they wanted. They'll need to replace two letters per row (in my example PS_RF: numbers would need to be changed to PS_TP: numbers). Something like an autohotkey script would make that pretty tolerable.
By default temperature goes from 25 to 75 so even just leaving them as 0 to 100 ranges would work fine for most people. Unlike every other field temperature allows numbers between -1000 and 1000 so they would probably have a hard time if they wanted to make used of a wider range of values just because you wanted to paint things on your map that don't really have different map tiles.
But I kid- you've got all those other variables showing the sort of complex things they do in the game so I'm sure you would want to show people all those nuances I mentioned before, except apparently not if you have to give them two lists side by side to say both ways it could be depending on the pole