I assume you are using 12-bit mode.
I assume you are looking at the data readings before any rounding.
They are spec'd to +/- 0.5 deg C at that temperature.
You should test them with the sensors connected together, so they are physically connected, and at the same temperature.
Out of the sun light, our of any air currents.
See how close they read.
You can also put them both, together, in a plastic baggie, (to keep the leads dry), and put it in ice water.
Again, see how close they read.
One assumes you have a stable, and clean, power supply.
JC
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