My Dad died from shoveling snow. He got cocky. Cardiologist told him a month earlier he was fine --took Dad off some of his meds, etc. Dad thought that meant he was now invincible. That day in March was not only cold, but very windy too. The actual temperature might have been in the 30s, but the wind chill was much lower. Anyway, Dad started shoveling for a few minutes, then the chest pains started. He made it back into a covered patio, took one of his nitro pills, but it was too late.
I have heart problems too. Cardiologist said don't go outside for more than a minute or two if the temperature is below 40 or above 80. I listen to my doctor. And I pay a guy to shovel the snow.