| Country | Climate |
| Mali | subtropical to arid; hot and dry (February to June); rainy, humid, and mild (June to November); cool and dry (November to February) |
| Malta | Mediterranean; mild, rainy winters; hot, dry summers |
| Marshall Islands | tropical; hot and humid; wet season May to November; islands border typhoon belt |
| Mauritania | desert; constantly hot, dry, dusty |
| Mauritius | tropical, modified by southeast trade winds; warm, dry winter (May to November); hot, wet, humid summer (November to May) |
| Mayotte | tropical; marine; hot, humid, rainy season during northeastern monsoon (November to May); dry season is cooler (May to November) |
| Mexico | varies from tropical to desert |
| Micronesia, Federated States of | tropical; heavy year-round rainfall, especially in the eastern islands; located on southern edge of the typhoon belt with occasionally severe damage |
| Moldova | moderate winters, warm summers |
| Monaco | Mediterranean with mild, wet winters and hot, dry summers |
| Mongolia | desert; continental (large daily and seasonal temperature ranges) |
| Montenegro | Mediterranean climate, hot dry summers and autumns and relatively cold winters with heavy snowfalls inland |
| Montserrat | tropical; little daily or seasonal temperature variation |
| Morocco | Mediterranean, becoming more extreme in the interior |
| Mozambique | tropical to subtropical |
| Namibia | desert; hot, dry; rainfall sparse and erratic |
| Nauru | tropical with a monsoonal pattern; rainy season (November to February) |
| Navassa Island | marine, tropical |
| Nepal | varies from cool summers and severe winters in north to subtropical summers and mild winters in south |
| Netherlands | temperate; marine; cool summers and mild winters |
| New Caledonia | tropical; modified by southeast trade winds; hot, humid |