I think air tempratures need to be added to affect how aircraft preform physically especially with taking off and landing performances here's a calculation below for my idea (scroll to the bottom to skip the calculation)

Airfield elevation 1000 feet AMSL
QNH 1000 (hPa)
OAT 10⁰C (50⁰F)

Nice round figgures

So to get our answer of Density Altitude (DA) we start by calculating the Pressure Hight (PH)

Notes: when QNH is ⬇️ from 1013 PH is ⬆️ and vice versa QNH ⬆️ PH is ⬇️

So it's 30 feet per hPa and since we're down by 13 hPa we times 13x30 to get 390
So 390 + 1000 feet since our QNH is lower then 1013 = 1390 feet PH

Now for our DA
So on a standard day it's 15⁰C (59⁰F) at sea level
So to calculate DA we need to find our ISA temp (standard day temp difference for the airfield alt since everything is based on mean sea level)
So it's 15⁰C - 2⁰ (it's 2 degrees C per 1000 feet and our airfield is at exactly 1000 feet so there for it's 2⁰C - ISA of 15⁰c to find our ISA temp at that altitude of 1000 ft)

So 15⁰C - 2⁰C = 13 so it's now 13 - 10 = 3 so 3 x 120 (don't ask me why it's x120 it's just the way it is some smart people figgured it out)

3x120 = 360 ft

So 360 + our PH of 1390 = 1750 Feet DA

PH = 1390
DA = 1750

What does this mean

In plain simple terms with the tempratures differences and QNH differences your aircraft will preform differently so the airfield in the example was 1000ft by the Density Altitude (DA) is 1750 ft meaning that your plane will preform at 1750 feet not 1000 ft meaning that it will need a longer takeoff run and landing distance will increase.

(Side note)
Tried to post on the Discord server and wouldn't allow me to so hence why I'm posting here