and Trampina Streets and in the lower part there is a monument dedicated to the Children of Sarajevo. Climate Sarajevo has either a humid continental climate (Köppen climate classification: Dfb), or an oceanic climate (Köppen climate classification: Cfb), depending on if either the 0 °C or the -3 °C isotherms are used. Sarajevo's climate exhibits four seasons and uniformly spread precipitation, typical of both Cfb and Dfb climates. The proximity of the Adriatic Sea moderates Sarajevo's climate somewhat, although the mountains to the south of the city greatly reduce this maritime influence. The average yearly temperature is , with January ( on average) being the coldest month of the year and July ( on average) the warmest. The highest recorded temperature was on 19 August 1946 and on 23 August 2008 (41.0), while the lowest recorded temperature was on 25 January 1942. On average, Sarajevo has seven days where the temperature exceeds and four days where the temperature drops below per year. The city typically experiences mildly cloudy skies, with an average yearly cloud cover of 45%. The cloudiest month is December (75% average cloud cover), while the clearest is August (37%). Moderate precipitation occurs fairly consistently throughout the year, with an average 75 days of rainfall. Suitable climatic conditions have allowed winter sports to flourish in the region, as exemplified by the 1984 Winter Olympics that were held in Sarajevo. Average winds are and the city has 1,769 hours of sunshine. Air quality Air pollution is a major issue in Sarajevo. According to the 2016 World Health Organization's Ambient Air Pollution Database, the annual average PM2.5 concentration in 2010 was estimated to be 30 μg/m3 based on PM10 measurement, which is 3 times higher than recommended by WHO Air Quality Guidelines for the annual average PM2.5. There are no recent direct long-term PM2.5 measurements available in Sarajevo and only estimates can be made from PM10, which is less health-relevant than PM2.5. Real-time air quality data in the form of PM10, ozone, NO2, CO and SO2 by the Federal Hydrometeorological Institute . History Ancient times One of the earliest findings of settlement in the Sarajevo area is that of the Neolithic Butmir culture. The discoveries at Butmir were made on the grounds of the modern-day Sarajevo suburb Ilidža in 1893 by Austro-Hungarian authorities during the construction of an agricultural school. The area's richness in flint was attractive to Neolithic humans,