A sign is covered in snow in Blair Atholl, Scotland, Britain May 6, 2021. REUTERS/Russell Cheyne

People stand on the Neva River embankment during snowfall as the Peter and Paul Cathedral is seen in background in central Saint Petersburg, Russia April 10, 2021. REUTERS/Anton Vaganov

A swan swims on Caldecotte Lake at dusk after snowfall, in Milton Keynes, Britain April 6, 2021. REUTERS/Andrew Boyers

Swans swim on Caldecotte Lake after snowfall, in Milton Keynes, Britain April 6, 2021. REUTERS/Andrew Boyers

A swan opens its wings on Caldecotte Lake after snowfall, in Milton Keynes, Britain April 6, 2021. REUTERS/Andrew Boyers

A swan swims on Caldecotte Lake after snowfall, in Milton Keynes, Britain April 6, 2021. REUTERS/Andrew Boyers

A woman walks across the medieval Charles Bridge during snowfall amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, April 6, 2021. REUTERS/David W Cerny

A woman walks across the medieval Charles Bridge during snowfall amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, April 6, 2021. REUTERS/David W Cerny

A woman walks across the medieval Charles Bridge during snowfall amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, April 6, 2021. REUTERS/David W Cerny

A woman walks across the medieval Charles Bridge during snowfall amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, April 6, 2021. REUTERS/David W Cerny

A woman walks across the medieval Charles Bridge during snowfall amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, April 6, 2021. REUTERS/David W Cerny

A man walks his dog across the medieval Charles Bridge during snowfall amid the coronavirus disease (COVID-19) outbreak in Prague, Czech Republic, April 6, 2021. REUTERS/David W Cerny

Container ship "Evelyn Maersk" is loaded during snowfall at a container terminal in a harbour amid the coronavirus disease (COVID-19) pandemic, in Hamburg, Germany, April 6, 2021. REUTERS/Fabian Bimmer

Container ship "Evelyn Maersk" is loaded during snowfall at a container terminal in a harbour amid the coronavirus disease (COVID-19) pandemic, in Hamburg, Germany, April 6, 2021. REUTERS/Fabian Bimmer

Container ship "Evelyn Maersk" is loaded during snowfall at a container terminal in a harbour amid the coronavirus disease (COVID-19) pandemic, in Hamburg, Germany, April 6, 2021. REUTERS/Fabian Bimmer

Container ship "Evelyn Maersk" is loaded during snowfall at a container terminal in a harbour amid the coronavirus disease (COVID-19) pandemic, in Hamburg, Germany, April 6, 2021. REUTERS/Fabian Bimmer

Kyrgyz riders take part in a Kok-Boru regional competition during snowfall in the village of Sokuluk in Chui Region, Kyrgyzstan March 30, 2021. Kok-Boru is a traditional Central Asian game similar to polo, in which horsemen try to drop the headless carcass of a goat in an opponent's goal. REUTERS/Vladimir Pirogov TPX IMAGES OF THE DAY

Kyrgyz riders take part in a Kok-Boru regional competition during snowfall in the village of Sokuluk in Chui Region, Kyrgyzstan March 30, 2021. Kok-Boru is a traditional Central Asian game similar to polo, in which horsemen try to drop the headless carcass of a goat in an opponent's goal. REUTERS/Vladimir Pirogov

Kyrgyz riders take part in a Kok-Boru regional competition during snowfall in the village of Sokuluk in Chui Region, Kyrgyzstan March 30, 2021. Kok-Boru is a traditional Central Asian game similar to polo, in which horsemen try to drop the headless carcass of a goat in an opponent's goal. REUTERS/Vladimir Pirogov

A man stands near his horses during a snowfall in the Chrea mountains, in Blida, Algeria March 22, 2021. Picture taken March 22, 2021. REUTERS/Ramzi Boudina

A woman reacts as she walks along a street amid snowfall in central Kyiv, Ukraine March 12, 2021. REUTERS/Gleb Garanich

A woman reacts as she walks along a street amid snowfall in central Kyiv, Ukraine March 12, 2021. REUTERS/Gleb Garanich

A woman walks her dog during snowfall in Stavropol, Russia March 12, 2021. REUTERS/Eduard Korniyenko

A woman walks her dog during snowfall in Stavropol, Russia March 12, 2021. REUTERS/Eduard Korniyenko

A view shows a residential area during snowfall in Kyiv, Ukraine March 8, 2021. REUTERS/Gleb Garanich

A woman sits on a sledge pulled by a boy during snowfall in Yevpatoriya, Crimea February 18, 2021. REUTERS/Alexey Pavlishak

The seismic observatory Degenried (Schweizerische Erdbeben Warte) of the Swiss Seismological Service at ETH Zurich is seen during snowfall in Switzerland January 14, 2021. Picture taken January 14, 2021. REUTERS/Arnd Wiegmann

The seismic observatory Degenried (Schweizerische Erdbeben Warte) of the Swiss Seismological Service at ETH Zurich is seen during snowfall in Switzerland January 14, 2021. Picture taken January 14, 2021. REUTERS/Arnd Wiegmann

The seismic observatory Degenried (Schweizerische Erdbeben Warte) of the Swiss Seismological Service at ETH Zurich is seen during snowfall in Switzerland January 14, 2021. Picture taken January 14, 2021. REUTERS/Arnd Wiegmann

A man walks past a monument to the so-called "Heavenly Hundred", the people killed during the Ukrainian pro-European Union (EU) mass protests in 2014, during snowfall in central Kyiv, Ukraine, February 18, 2021. REUTERS/Gleb Garanich TPX IMAGES OF THE DAY

A picture taken with a drone shows roofs of buildings and houses covered with snow following snowfall in Hebron in the Israeli-occupied West Bank February 18, 2021. REUTERS/Yosri Aljamal

A picture taken with a drone shows roofs of buildings and houses covered with snow following snowfall in Hebron in the Israeli-occupied West Bank February 18, 2021. REUTERS/Yosri Aljamal

A picture taken with a drone shows the Ibrahimi Mosque, which Jews call the Jewish Tomb of the Patriarchs, following snowfall in Hebron in the Israeli-occupied West Bank February 18, 2021. REUTERS/Yosri Aljamal

A Palestinian boy plays with snow following snowfall in Ramallah in the Israeli-occupied West Bank February 18, 2021. REUTERS/Mohamad Torokman

Palestinians play with snow following snowfall in Ramallah in the Israeli-occupied West Bank February 18, 2021. REUTERS/Mohamad Torokman

A Palestinian woman walks past a statue following snowfall in Ramallah in the Israeli-occupied West Bank February 18, 2021. REUTERS/Mohamad Torokman

Palestinian children build a snowman following snowfall in Ramallah in the Israeli-occupied West Bank February 18, 2021. REUTERS/Mohamad Torokman

The sculpture "Runners" by Greek sculptor Theodoros Papagiannis casts a shadow on the snow following heavy snowfall in Dionysos, Greece, February 17, 2021. Picture taken with a drone. REUTERS/Alkis Konstantinidis

People have their meals as part of a charity event to distribute food among lower-income and homeless people during snowfall in Stavropol, Russia February 17, 2021. REUTERS/Eduard Korniyenko

Men gather to receive meals as part of a charity event to distribute food among lower-income and homeless people during snowfall in Stavropol, Russia February 17, 2021. REUTERS/Eduard Korniyenko

People queue before receiving their meals as part of a charity event to distribute food among lower-income and homeless people during snowfall in Stavropol, Russia February 17, 2021. REUTERS/Eduard Korniyenko

Men gather to receive meals as part of a charity event to distribute food among lower-income and homeless people during snowfall in Stavropol, Russia February 17, 2021. REUTERS/Eduard Korniyenko

People queue before receiving their meals as part of a charity event to distribute food among lower-income and homeless people during snowfall in Stavropol, Russia February 17, 2021. REUTERS/Eduard Korniyenko

The Parthenon temple is seen atop the Acropolis hill following snowfall, in Athens, Greece, February 17, 2021. REUTERS/Vassilis Triandafyllou

The Parthenon temple is seen atop the Acropolis hill following snowfall, in Athens, Greece, February 17, 2021. REUTERS/Vassilis Triandafyllou

Two men sit on Lycabettus hill as the Parthenon temple is seen atop the Acropolis hill following snowfall in Athens, Greece, February 17, 2021. REUTERS/Vassilis Triandafyllou

A man rides his bike on Filopappou hill as the Parthenon temple is seen in the background during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis

People make their way on Filopappou hill as the Parthenon temple is seen in the background during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis

A woman wearing a protective face mask, amid the coronavirus disease (COVID-19) outbreak, walks past snowbanks along a street after snowfall on a frosty winter day, in central Kyiv, Ukraine February 16, 2021. REUTERS/Gleb Garanich

A woman wearing a protective face mask, amid the coronavirus disease (COVID-19) outbreak, walks past snowbanks along a street after snowfall on a frosty winter day, in central Kyiv, Ukraine February 16, 2021. REUTERS/Gleb Garanich

People take photos on a snow-covered beach during heavy snowfall in the suburb of Glyfada, in Athens, Greece, February 16, 2021. REUTERS/Stelios Misinas

Two children make a snowman on a beach during heavy snowfall in the suburb of Glyfada, in Athens, Greece, February 16, 2021. REUTERS/Stelios Misinas

Two swimmers are seen on a snow-covered beach during heavy snowfall in the suburb of Glyfada, in Athens, Greece, February 16, 2021. REUTERS/Stelios Misinas

Two children make a snowman on a beach during heavy snowfall in the suburb of Glyfada, in Athens, Greece, February 16, 2021. REUTERS/Stelios Misinas

Two swimmers are seen on a snow-covered beach during heavy snowfall in the suburb of Glyfada, in Athens, Greece, February 16, 2021. REUTERS/Stelios Misinas

Snow covers a beach following a heavy snowfall in Artemida, Greece, February 16, 2021. Picture taken with a drone. REUTERS/Vassilis Triandafyllou

A man poses next to a snowman wearing a protective face mask and reading "COVID-19", in Athens, Greece, February 16, 2021. REUTERS/Vassilis Triandafyllou

People make their way as the Parthenon temple is seen atop the Acropolis hill archaeological site during a heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis