| Country | Climate |
| Australia | generally arid to semiarid; temperate in south and east; tropical in north |
| Austria | temperate; continental, cloudy; cold winters with frequent rain and some snow in lowlands and snow in mountains; moderate summers with occasional showers |
| Azerbaijan | dry, semiarid steppe |
| Bahamas, The | tropical marine; moderated by warm waters of Gulf Stream |
| Bahrain | arid; mild, pleasant winters; very hot, humid summers |
| Bangladesh | tropical; mild winter (October to March); hot, humid summer (March to June); humid, warm rainy monsoon (June to October) |
| Barbados | tropical; rainy season (June to October) |
| Belarus | cold winters, cool and moist summers; transitional between continental and maritime |
| Belgium | temperate; mild winters, cool summers; rainy, humid, cloudy |
| Belize | tropical; very hot and humid; rainy season (May to November); dry season (February to May) |
| Benin | tropical; hot, humid in south; semiarid in north |
| Bermuda | subtropical; mild, humid; gales, strong winds common in winter |
| Bhutan | varies; tropical in southern plains; cool winters and hot summers in central valleys; severe winters and cool summers in Himalayas |
| Bolivia | varies with altitude; humid and tropical to cold and semiarid |
| Bosnia and Herzegovina | hot summers and cold winters; areas of high elevation have short, cool summers and long, severe winters; mild, rainy winters along coast |
| Botswana | semiarid; warm winters and hot summers |
| Bouvet Island | antarctic |
| Brazil | mostly tropical, but temperate in south |
| British Indian Ocean Territory | tropical marine; hot, humid, moderated by trade winds |
| British Virgin Islands | subtropical; humid; temperatures moderated by trade winds |
| Brunei | tropical; hot, humid, rainy |