Siberia's coldest region - the Sakha Republic, also known as Yakutia - also experienced a highly unusual heatwave. Picture: @irenkolbina

On 1 July Ulan-Ude experienced its highest ever temperature on this day - a tropical 33.8C - causing a performance of the Republic of Buryatia's first national opera to be cut almost in half because of the stifling heat.

Unprecedented high temperatures, up to 6C higher than average, have also hit Krasnoyarsk and Irkutsk regions. Siberia's coldest region - the Sakha Republic, also known as Yakutia - also experienced a highly unusual heatwave.

At Bestyakh fur farm, the temperature was 32.2C, while Mirny hit 33.6C, Chumpuruk 33.8C, Habardino 34.7C and Kresty 35C.

Yet in Siberia's largest airport, Tolmachevo in Novosibirsk, a huge downpour left the main passenger terminal underwater. Checkin for flights had to be done manually because of the flooding.

Residents of Ulan-Ude and Yakutsk try to refresh in any way they can. Pictures: @_dejames_, CrimYakutia, @fainanega

Eyewitness Nikita Lapov told NGS: 'At about 9 am the shower began, a large group of people went out the airport, but could not reach their cars and buses, because of the rain.

'They came back inside the airport. And in the check-in zone ceiling tiles were falling down. First, one fell, and the water poured down from the hole. Then three more fell down.'

Heavy rains also hit Altai, Kemerovo and Omsk regions. In Omsk, on 2 July, a car 'drowned' in the big puddle near a multi-storey residential building on Lapteva Street.

Flood in Novosibirsk airport Tolmachevo. Car 'drowned' in Omsk. A girl swimming in puddle in Kemerovo. Pictures: Nikita Lapov, Ivan Shchipachev, Ju Mori

Locals say that the giant puddle was nicknamed the 'Laptev Sea'. The car was flooded with water up to the wheel.

Eyewitness say that the driver was 'reckless and tried to drive through the puddle with the side window fully opened, so the water began to flood the vehicle interior very quickly'.

Local official Vladimir Kazimirov blamed the lack of a 'storm drain'. 'We have pumped out 30 barrels of water from Lapteva Street per night.

'The problem is, that we have the storm drain only on 22-23% of streets, the other are constantly flooded.'