A study examined the relationship between different types of learning climates and the levels of academic achievement in extra-mural classes in Nigeria. Investigated during the course of the study were the following six types of learning climates: open, autonomous, controlled, familiar, paternal, and closed. To determine what, if any, relationship exists between learning environment and academic achievement, researchers administered two research instruments to a random sample of 800 adults who were attending extra-mural classes in various locations in Nigeria. After subjecting the data to a variety of statistical analyses, researchers arrived at the following conclusions: (1) learning climates vary from one subject to another; (2) standards of academic achievement attained by adult learners also vary according to subject; and (3) there is no significant relationship between learning climate and adult academic achievement in extra-mural classes. Recommendations called for continued research to determine those factors that may affect the degree of academic achievement attained by adult learners. (Author/MN)