Information from the American Institute of Medical Climatologists on human responses to weather and climatic conditions, including clouds, winds, humidity, barometric pressure, heat, cold, and other variables that may exert a pervasive impact on health, behavior, disposition, and the level of efficiency with which individuals function is reviewed. These topics are discussed: (1) environmental effects; (2) cold weather effects; (3) hot weather effects; (4) weather's effects upon ailments, including arthritis, asthma, headaches, common colds, bronchitis and emphysema, ulcers and intestinal disorders, heart disease, hypertension, leukemia, eye disorders, and feeling pain; and (5) psychological effects of weather and climate. Included are suggestions for ways that individuals can adapt to changing weather conditions or select climates most suitable for their individual differences. (CS)