Use the PICs Watchdog Timer as a temperature sensor! Its frequency changes linearly over temperature, so it's possible to build a thermometer without external chip! See Microchip App Note AN720. They claim accuracy up to 1 degree Celsius.
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<A HREF="http://www.sxlist.com/techref/scenix/lib/io/osi1/sensor/temp.htm"> PIC temp with Watch Dog Timer</A>
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