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

People make their way atop the Filopappou hill during a heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis

People make their way at the Zappeion area during heavy snowfall in Athens, Greece, February 16, 2021 REUTERS/Costas Baltas TPX IMAGES OF THE DAY

People make their way on the snow-covered Areopagitou pedestrian street under the Acropolis hill archaeological site during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis

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

Two men jog 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 TPX IMAGES OF THE DAY

A view of the Parthenon temple atop the Acropolis hill archaeological site during a heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Costas Baltas

A man rides his bike on Filopappou hill during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis

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/Costas Baltas

A pedestrian makes his way across the snow-covered Syntagma square amid heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Costas Baltas

A pedestrian walks with an umbrella next to Hadrian's Gate, during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Costas Baltas

General view of the snow-covered archaeological site of the Temple of Zeus during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Costas Baltas

People make their way on Filopappou hill during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis

A man carrying his skis makes his way on Filopappou hill during a heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis

A man wearing a protective face mask makes his 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

A man rides his bike 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

A man walks his dog amid heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Costas Baltas

A woman holding an umbrella walks past the parliament building during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis

People make their way on Syntagma square with the parliament building seen in the background, during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis

People make their way on Syntagma square during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis

Footprints are seen on the snow on Syntagma square during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis

A woman covers herself with a plastic bag as she makes her way on Syntagma square during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis

A man wearing a protective face mask makes his way on Syntagma square during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis

People make their way on Syntagma square during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Alkis Konstantinidis

A man walks with un umbrella in front of the parliament building amid heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Costas Baltas

People make their way across the snow-covered Syntagma square during heavy snowfall in Athens, Greece, February 16, 2021. REUTERS/Costas Baltas