| Country | Climate |
| Gambia, The | tropical; hot, rainy season (June to November); cooler, dry season (November to May) |
| Gaza Strip | temperate, mild winters, dry and warm to hot summers |
| Georgia | warm and pleasant; Mediterranean-like on Black Sea coast |
| Germany | temperate and marine; cool, cloudy, wet winters and summers; occasional warm mountain (foehn) wind |
| Ghana | tropical; warm and comparatively dry along southeast coast; hot and humid in southwest; hot and dry in north |
| Gibraltar | Mediterranean with mild winters and warm summers |
| Greece | temperate; mild, wet winters; hot, dry summers |
| Greenland | arctic to subarctic; cool summers, cold winters |
| Grenada | tropical; tempered by northeast trade winds |
| Guam | tropical marine; generally warm and humid, moderated by northeast trade winds; dry season (January to June), rainy season (July to December); little seasonal temperature variation |
| Guatemala | tropical; hot, humid in lowlands; cooler in highlands |
| Guernsey | temperate with mild winters and cool summers; about 50% of days are overcast |
| Guinea | generally hot and humid; monsoonal-type rainy season (June to November) with southwesterly winds; dry season (December to May) with northeasterly harmattan winds |
| Guinea-Bissau | tropical; generally hot and humid; monsoonal-type rainy season (June to November) with southwesterly winds; dry season (December to May) with northeasterly harmattan winds |
| Guyana | tropical; hot, humid, moderated by northeast trade winds; two rainy seasons (May to August, November to January) |
| Haiti | tropical; semiarid where mountains in east cut off trade winds |
| Heard Island and McDonald Islands | antarctic |
| Holy See (Vatican City) | temperate; mild, rainy winters (September to May) with hot, dry summers (May to September) |
| Honduras | subtropical in lowlands, temperate in mountains |