PRAGUE, Sept. 6 (Xinhua) -- This year's Prague experienced its hottest summer in the last 244 years with the average temperature of 22.7 degrees Celsius measured in the Klementinum meteorological observatory, Czech Hydrometeorological Institute revealed on its website on Thursday.

Klementinum is the oldest meteorological observatory in the Czech Republic, and it has watched the weather since 1775.

Before, the hottest summer was recorded in 2003 with the average temperature of 22.4 degrees, followed by 2015, when the average temperature reached 22.3 degrees Celsius in June, July and August.

The meteorological summer lasts between the beginning of June and end of August. According to meteorologists, the temperature in 2018 reached the record hot level in Prague-Klementinum, with the highest average value over the whole 244 years since the beginning of the available measurements.

All the three hottest summers over the past 244 years occurred in this century, the fourth place is the summer of 1834 with an average temperature of 22.1 degrees.

Nationally, the monthly average temperatures have only been recorded since 1961 in Czech Republic.