The city features brief, warm summers and long, bitterly cold and dry winters. The coldest January temperatures, usually at the time just before sunrise, are between  with no wind, due to temperature inversion. Most of the annual precipitation of  falls from May to September. The highest recorded precipitation in the city was  at the Khureltogoot Astronomical Observatory on Mount Bogd Khan Uul. Ulaanbaatar has an average annual temperature of , making it the coldest capital in the world (almost as cold as Nuuk, Greenland, but Greenland is not independent). Nuuk has a tundra climate with consistent cold temperatures throughout the year. Ulaanbaatar's annual average is brought down by its cold winter temperatures whereas it is significantly warm from late April to early October.