Different temperature reports

[Carmel NY]

Why would sysctl and smartctl report different temperatures? Smartctl is
reporting 30C and sysctl is showing 40.1C.

#! /usr/bin/env bash

TP=$(/usr/local/sbin/smartctl -a /dev/ada0 | grep Temp | awk -F " " '{printf "%d",$10}')

printf "%s\n\n" "${TP}"

TP2=$(/sbin/sysctl -a | grep -i hw.acpi.thermal.tz0.temperature | awk '{print substr($2,0,5)}')

printf "%s\n\n" "${TP2}"

exit

Both temperatures are in Celsius.

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Carmel