Which is generally not classified as a weather parameter?

The correct option is Soil pH.

Weather parameters are atmospheric conditions that can change rapidly over short periods and determine the day-to-day state of the atmosphere. Common weather parameters include:

• Temperature: Measures how hot or cold the atmosphere is.
• Humidity: Measures the amount of water vapor present in the air.
• Wind: Describes the movement of air masses across the Earth's surface.

In contrast, Soil pH is a measure of the acidity or alkalinity of the soil, which is a chemical property of the ground rather than an atmospheric or weather parameter. Therefore, Soil pH is not classified as a weather parameter.