Chapter 5 Global Temperatures Geosystems 6e An Introduction to Physical Geography Robert W. Christopherson Charles E. Thomsen

Earth’s Temperature Patterns Isotherm – an isoline (a line of constant value) that connects points of equal temperature Thermal equator – isotherm connecting all points of highest mean temperature January Temperature Map   Thermal equator movement southward More pronounced over large continents July Temperature Map   Thermal equator movement northward

January Temperatures Figure 5.14

July Temperatures Figure 5.16

Global Temperature Ranges Figure 5.17

Arctic Sea Ice Changes Figure HLC 5.1.1

Air Temperature and the Human Body Wind chill – the apparent temperature when you take wind speeds into account Correlates cold and wind speed Heat index – the apparent temperature when you take humidity into account Correlates heat and humidity

Wind Chill Table Figure FS 5.1.1

Heat Index Table Figure FS 5.1.2