As slope gradient increases avalanche danger increases, the prime gradient is 38degrees.
As gradient increases the risk of avalanches start to decrease again.
In continental and intermountain avalanche climates, avalanches on slopes steeper than 50deg.
are a rare sight.
Where maritime climates are wetter large scale avalanches can be found on 60deg slopes.
I would advise using an inclinometer to measure questionable gradients.
Fairly unstable needed
35-45 - Majority of avalanches occur in this gradient bracket, 38 deg.
Being the
optimum gradient for avalanche activity.