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This is an example from last week, I took off around 6pm when it was still reasonably warm, when the temperature dropped after sunset it starts missing beats and reporting nonsense values. The intensity didn't change, nor did my perceived heart rate. It might have been slightly lower, but nowhere near the reported ~85 bpm.
See my expertly drawn blue line for an estimate of what it should have been.
To be clear, I'm not saying this holds true for all optical sensors, but it did the exact same thing last year so I wanted to go back to chest-HR.
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Tijmen
Why is optical worthless in the cold?