Which observation is most characteristic of crossing a weather front?

• A. Change in temperature
• B. Constant humidity
• C. Decreasing wind speed only
• D. No cloud change

Answer: (A)

When you move from one air mass to another, you’re crossing a boundary where the air’s properties change, and the most noticeable of these is temperature. Weather fronts separate air masses of different temperatures, so the temperature will rise or fall as you cross the boundary. That clear temperature change is the hallmark you’ll feel or observe.

Humidity can change as air masses mix, but it isn’t as dependable a signal as temperature. Wind can shift in direction or speed near a front, but it’s not guaranteed to do so in every crossing. Cloud patterns often change with fronts, so saying there’s no cloud change isn’t accurate.