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Run at 50F weather and get your lungs acclimated to slightly chilly temps. For me, it takes a week or two to get used to even 50F.

Then, once your lungs are used to that, 40F and 30F are next.

I never went below that this past winter. But lung cold weather training definitely exists. Your body really does adapt if you give it the few weeks it needs.

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I run in -20 and sweat. That's because I wear face coverings and lots of clothing. I've never had any issues with breathing or pain in lungs.

This may be more common with high volume workouts. I don’t get it on short runs, but distance skiing for 2-3+ hours will take a toll. This isn’t something that happens when I cycle or rollerski for an equivalent workout.

When temperatures drop quickly I find that I need to do a few nose-only breathing workouts (low intensity, HR between 60-70% of max) in order to acclimate like this.

Nose breathing probably helps because your nose will warm up the air before it enters your lungs.

It takes some getting used to, but you probably should breath-in (nose) breath out (mouth) anyway, even in warmer weather. (Keep the CO2 on one side, and fresh O2 stream coming in with slightly better efficiency)

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