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[Again_Dejavu]

So, it's summer at my new fort and the water is all wonky

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And at the top

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Why is it not unfreezing all the way?

[Merendel]

Is your embark accross several bioms?  I've never seen that in particular before but my guess would be the southern half of your embark is a biom that is cold but thaws out in the summer and the northern half is a freezing biom that never thaws.  Not sure why you'd get a few patches of liquid water under the ice in that situation however.

[Sutremaine]

Biome boundaries could get that uneven, but the cluster of bauxite says it's right in the middle of an embark tile. Do biome boundaries ever get that far into an embark tile?

[Again_Dejavu]

It's all one biome

[CaptainArchmage]

Biome boundaries could get that uneven, but the cluster of bauxite says it's right in the middle of an embark tile. Do biome boundaries ever get that far into an embark tile?

Biome boundaries can get right to the center of an embark tile, if you embark in a half grassland/half forest biome for example. You may also get one biome as igneous extrusive and the other as sedimentary.

There can also be variations within biomes, for example the same forest biome is partly warm and partly temperate. The same applies to aquifer presence, soil, and minerals.

[Again_Dejavu]

It's all one biome

[nanomage]

It's all one biome

I think you are wrong here. Biome boundaries are the only known (for me at least) cause for the effect you observe. You see, there don't have to be actually two different biomes. You can very easily have one cold grassland bordering another cold grassland, with no differences in plants or wildlife whatsoever, and in that case the border would hardly be noticeable in game. I would advise copying the region and checking the embark tile for biome boundaries, if you haven't already done that.

[Drazinononda]

With respect to the previous discussion, are we quite sure that the worldgen temperature mesh is, in fact, tied to biomes? I'd be quite surprised if it is, considering that forests and mountain ranges can have a rather large north-south range, while temperature is much more consistent of a gradient. AD may have found a temperature border within a single biome. Experienced players may recall any number of times that snow across a single-biome embark melted in stages.

[smirk]

As far as I've always seen, temperature and weather are tied directly to biomes, happening all across their biome all at once. That's why you can get snowstorms in a multi-biome embark that will perfectly outline the biome they're happening in, and no farther. And if you have a large body of water running across said embark, you can see that the freeze/thaw line will coincide exactly with the snowstorm/biome boundary. The wobbliness of the line comes from the game fudging biome boundaries like it does with terrain, so everything doesn't end up blocky.

[Again_Dejavu]

Also, the snow as cooperative and all of it melted at the same time, which really is odd

[Urist MacNoob]

Don't question it.

Just built an ice fortress in a temperate biome. Tell nature to go home and get a new job.