Ambient temperature sensing

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Hi,

I'm looking for a circuit that will represent temperature ranges up to 60
degrees (celcius) using at least 3 LED's or transistors as the outputs for
each range, but I DO NOT  want a digital display like a 7-segment or LCD
though.
I want to be able to utilize these outputs to control others parts of my
circuitry (perhaps like voltage calibration).

Example:
LED 1 (green)  = -10-20 degrees,
LED 2 (yellow) =  20-30 degrees,
LED 3 (red)     =   40+ degrees,

I am open to all suggestions.
Thanks in advance.

J






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