In regard to weight and balance, when are "winter weights" used to calculate the loading of the aircraft?

The use of "winter weights" for calculating the loading of an aircraft is specifically associated with the period when winter weather conditions are expected to influence passenger attire and baggage. During the winter months, typically from November 1 to April 30, individuals tend to wear heavier clothing such as coats, boots, and other warm gear, which can significantly increase their weight.

Employing winter weights during this timeframe ensures that the aircraft’s weight and balance calculations are accurate, accounting for the additional weight due to winter attire. This is crucial for operational safety, as improper weight and balance calculations can lead to performance issues during takeoff, in-flight, and landing.

The other options would not accurately reflect the period in which adjustments should be made for seasonal attire, which is why they are not considered correct.