Weather is an important factor that influences aircraft performance and flying safety. It is the state of the atmosphere at a given time and place, with respect to variables such as temperature (heat or cold), moisture (wetness or dryness), wind velocity (calm or storm), visibility (clearness or cloudiness), and barometric pressure (high or low).
AC-00-6
AC-00-45
AIM 7-1
PHAK Ch-12
91.103
ERAU Aviation Weather Guide
Private Pilot PTS Page 32
Instrument PTS Page 27
Commercial Pilot PTS Page 32