Source: The Library Of Congress Country Studies
Turkmenistan has a subtropical desert climate that is severely continental. Summers are long (from May through September), hot, and dry, while winters generally are mild and dry, although occasionally cold and damp in the north. Most precipitation falls between January and May; precipitation is slight throughout the country, with annual averages ranging from 300 millimeters in the Kopetdag to eighty millimeters in the northwest. The capital, Ashgabat, close to the Iranian border in south-central Turkmenistan, averages 225 millimeters of rainfall annually. Average annual temperatures range from highs of 16.8°C in Ashgabat to lows of -5.5°C in Dashhowuz, on the Uzbek border in north-central Turkmenistan. The almost constant winds are northerly, northeasterly, or westerly.
Data as of 1996