Sometimes for the better, but often for the worse. Especially dangerous are sudden rises in temperatures. Increasing temperatures, especially with rain on top of new snow - generally mean hazardous avalanche conditions. Cooler temperature may improve snowpack stability, but always beware. Other factors like wind can destabilize conditions causing a false sense of security.
Avalanches are very complex.
Anyone venturing out to enjoy the back country should have a through knowledge of the risk and rescue techniques. Many local mountaineering clubs ,like the Mountaineers and REI, have more information about avalanches and courses to help you understand the dangers. This is one of the great weather misconceptions. No, it is never to cold to snow. The reason for this idea of being to cold to snow is simple.