What is a sign that flying conditions may improve after a rainy period?

A rising barometer is a significant indicator that flying conditions may improve following a rainy period. Barometers measure atmospheric pressure, and a rise in pressure often suggests that the weather is stabilizing and drier air is moving into the area. This can lead to clearing skies and improved visibility, making it more suitable for flying.

In contrast, a drop in temperature, increased cloud cover, or strong winds aloft typically do not signify an immediate improvement in flying conditions. A drop in temperature may suggest that moisture remains in the air, which can keep conditions overcast or even lead to additional precipitation. Increased cloud cover generally indicates poor visibility and potential for further rain. Strong winds aloft can also create turbulence and challenging flying conditions, rather than improving them. Therefore, the rising barometer is the most reliable sign of improving weather following rain.