El Alto, Bolivia experiences a mild climate with significant diurnal temperature variations. Winters are cool and frosty, especially in June and July when temperatures often drop below freezing at night. Spring and autumn are relatively mild, with temperatures gradually warming up from March to May and again from September to November. Summers are the warmest months, but still mild compared to other parts of the world, with average highs rarely exceeding 20°C (68°F). The coolest period is during the dry winter months, while the warmer months see a slight increase in temperature.