Yes commercial growers and university studies have proven higher temps reduce potency.
Strain specific but some were up to 20% reduced from control.
The damage is progressive with higher temps.

JIMKSI64 said:

Yes commercial growers and university studies have proven higher temps reduce potency.
Strain specific but some were up to 20% reduced from control.
The damage is progressive with higher temps.

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Thats the problem with Southern Cal outdoor growing, temps are usually still spiking in the 90's through October. You lose your monoterps first, the grapefruit and pine smells. If a plant gets a couple consecutive hot days, it will restore some of the smell in a day or two as the plant generates more but you don't get back what you lose. A good way to preserve those monoterps is drop your temperature below 70 degrees (sorry, I use Fahrenheit because, well... 'Murica) and/or harvest your plant before the lights kick on for the day.