The angle of 32° for the lower bound angle given in the answer by @Pytrik reminded me of the "typical" angle of repose for most materials, particularly soil and rock.
The angle of repose is defined as,
The steepest angle of descent or dip relative to the horizontal plane to which a material can be piled without slumping.
Angle of repose experiments with snow: role of grain shape and cohesion was published Cambridge University Press on 27 May 2020.
The shape of the snow particles, their cohesion and temperature and whether or not the snow had become sintered all factor into angle of repose for snow for a given set of conditions.
In the experiments, we observed a significant influence of particle shape and cohesion, with both factors increasing the angle of repose. The influence of shape was revealed by examining different snow types and spherical particles, and the cohesion, assumed to be caused by sintering, was examined by varying the temperature. Complex-shaped snow particles clearly formed larger angles than the spherical particles. More specifically, the smaller the shape parameter, the larger was the angle of repose. The influence of cohesion was negligible at temperatures below −22°C, but increased as the temperature increased to −2°C.
It was observed the angle of repose increased the more shape of a snow particle deviated from a sphere. Basically, the more angular the snow particle the higher its angle of repose.
When it comes to the effects of sintering, the angle of repose ...
increased at higher temperatures, between −15 and −5, and even more between −5 and −2°C.
Often, sintering is discussed in close connection to friction, which constitutes another temperature-dependent process for ice. However, its role in the angle of repose is not clear. While it is the key parameter in Mohr–Coulomb theory, which is often used for a theoretical analysis of the angle of repose (MCGlinchey, Reference McGlinchey2005), other studies conclude that friction plays a sub-dominant role behind particle shape and cohesion, and can therefore be neglected (Nowak and others, Reference Nowak, Samadani and Kudrolli2005).
The picture below is taken from the article. Particle with a smoother shape have a lower angle of repose; the bottom set of blue lines with an angle of repose around 20°. The more angular the shape of the particles, the higher the angle of repose; the yellow and green lines with an angle of repose around 30° to 40°, depending on temperature. In both of these situations, the angle of repose increase with temperature.
The fact that snow can deposit on a vertical surface would indicate the snow particles would be angular and would have a degree of sintering.