Figure 9 – isotherms in the month of July

3.2. Temperature Anomaly

The difference between the mean temperature of any place and the mean temperature of its parallels is known as temperature anomaly. On the map the lines joining the places of equal temperature anomaly are known as Isothermal anomaly lines.

Temperature anomaly could be positive or negative. Due to uneven distribution of land and water the maximum temperature anomalies are found in the Northern Hemisphere and minimum in the Southern Hemisphere.