
Monthly averages of the air temperature in Bissau have been grouped into classes of equal length, 1.0°C. The 45 years period of investigation has been divided into equal sub periods of 5 years each. The number of temperature in each class was counted and the results of this treatment presented in tabular forms. The analysis of these tables has shown that the air temperature in Bissau is slowly increasing, particularly by the end of the period of investigation.