Two pieces of glass, one piece of redstone. The thermometer will tell you want the temperature is... one line shows you where ice will form (not sure if that's the same temp where snowmen will make snow), another will show you where snowmen will melt. If you get near lava sources (within 3 blocks) the temperature will go up 2 grades. Campfires will raise it 2 grades and furnaces/smelters/smokers will raise 1 (since they are enclosed). Near water cools it 1 step.
You could probably work out more specific temperature indicators. It would be good for avoiding lava underground and for spotting when your tunnel has gotten into a new biome.
If placed in the world it would also give off a redstone pulse based on how hot it is, possibly allowing for some interesting detection possibilities for lava/water devices.
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