How does weather affect firearm handling?

Moisture plays a crucial role in the care and maintenance of firearms. When firearms are exposed to high levels of moisture, especially in the form of rain or high humidity, there is a significant risk of rust developing on metal components. Rust can not only damage the firearm's finish but also affect its function by corroding critical parts such as the barrel, action, and internal mechanisms. Proper storage and maintenance practices, such as keeping firearms dry and using protective coatings, are essential in preventing moisture-related damage.

In contrast, the other options do not correctly reflect how weather impacts firearm handling. Rain does not improve accuracy; rather, it can obscure sights and create a slippery grip. Cold temperatures do not inherently make firearms heavier; instead, they can affect the operation of the firearm and the shooter's dexterity. Wind can certainly impact the trajectory of a bullet, but it does not directly affect the sight alignment itself, although wind conditions need to be accounted for when aiming.