The silhouette of a cat walking on top of a fence stands out against the sky during sunrise near Sehnde, Germany on Tuesday. Indian summer, or Altweibersommer (old womens summer) in German, is a weather phenomenon which often brings sunny weather between mid-September and the start of October in parts of central Europe.

Julian Stratenschulte/EPA

The silhouette of a cat walking on top of a fence stands out against the sky during sunrise near Sehnde, Germany on Tuesday

A man rides his bicycle as people walk on the "first mobile phone sidewalk in China", which was recently installed at a tourism area in Chongqing municipality...A man rides his bicycle as people walk on the "first mobile phone sidewalk in China", which was recently installed at a tourism area in Chongqing municipality, September 13, 2014. The mobile phone sidewalk in Chongqing was divided into two sides -- one was written with "Cellphones walk in this lane at your own risk" while the other with "No cellphones", as an attempt to reduce pedestrian incidents, local media reported. Picture taken September 13, 2014.

China Daily/Reuters

A man rides his bicycle as people walk on the “first mobile phone sidewalk in China”, which was recently installed at a tourism area in Chongqing municipality

Fiji's military strongman Voreqe Bainima...Fiji's military strongman Voreqe Bainimarama (C) attends a national thanksgiving service for the release of the 45 Fijian peacekeepers kidnapped by Al-Qaeda linked Syrian rebels on the Golan Heights last month, at the ANZ Stadium in the capital Suva on September 16, 2014. Speaking at the service, Fiji President Epeli Nailatikau called for a violence-free election as the South pacific nation prepares to return to democracy almost eight years after a military coup. AFP PHOTO/Peter PARKSPETER PARKS/AFP/Getty Images

Peter Parks/AFP/Getty

Fiji’s military strongman Voreqe Bainimarama attends a national thanksgiving service for the release of the 45 Fijian peacekeepers kidnapped by Al-Qaeda linked Syrian rebels on the Golan Heights last month, at the ANZ Stadium in the capital Suva. Speaking at the service, Fiji President Epeli Nailatikau called for a violence-free election as the South pacific nation prepares to return to democracy almost eight years after a military coup. Read more

An aerial picture taken on September 14,...An aerial picture taken on September 14, 2014 shows lava flowing out of the Bardarbunga volcano in southeast Iceland. The Bardarbunga volcano system has been rocked by hundreds of tremors daily since mid-August, prompting fears the volcano could explode. Bardarbunga, at 2,000 metres (6,500 feet), is Iceland's second-highest peak and is located under Europe's largest glacier, Vatnajoekull. AFP PHOTO /  BERNARD MERICBERNARD MERIC/AFP/Getty Images

Bernard Meric/AFP/Getty

An aerial picture shows lava flowing out of the Bardarbunga volcano in southeast Iceland. The Bardarbunga volcano system has been rocked by hundreds of tremors daily since mid-August, prompting fears the volcano could erupt. Bardarbunga, at 2,000 metres (6,500 feet), is Iceland’s second-highest peak and is located under Europe’s largest glacier, Vatnajoekull. Read more

A spider is seen in its dew covered  web in Hohen Meissner, Germany.

Uwe Zucchi/AFP/Getty Images

A spider is seen in its dew covered web in Hohen Meissner, Germany.

No campaigner Judy Shaw Stewart from Doune as she sits out at the A84 to protect vandalised NO Thanks signs  ahead of the Scottish Referendum on September 18th.  PRESS ASSOCIATION Photo. Picture date: Monday September 15, 2014.

Andrew Milligan/PA

No campaigner Judy Shaw Stewart from Doune as she sits out at the A84 to protect vandalised NO Thanks signs on Monday ahead of the Scottish Referendum on September 18th

A Kurdish Peshmerga fighter launches mortar shells towards Zummar, controlled by Islamic State (IS), near Mosul September 15, 2014.

Ahmed Jadallah /Reuters

A Kurdish Peshmerga fighter launches mortar shells towards Zummar, controlled by Islamic State (IS), near Mosul in Iraq

Attilane Forgacs wades in water flooding her house in Siofok, 102 kms southwest of Budapest, Hungary, Monday, Sept. 15, 2014, after three months  amount of rain fell on the town on Sunday.

MTI/Szilard Koszticsak/AP

Attilane Forgacs wades in water flooding her house in Siofok, 102 kms southwest of Budapest, Hungary on Monday, after three months worth of rain fell on the town on Sunday.

A model displays a Autumn/Winter design by Andres Sarda during the young designers show at Madrid's Fashion Week in Madrid, Spain, Monday, Sept. 15, 2014. (AP Photo/Daniel Ochoa de Olza)

Daniel Ochoa de Olza/AP

A model displays a Autumn/Winter design by Andres Sarda during the young designers show at Madrid’s Fashion Week in Madrid, Spain,

Smoke from grenades shrouds horses and riders during a practice session for members of the Dutch cavalry in Scheveningen, Netherlands, Monday, Sept. 15, 2014. About 80 horses and riders were rehearsing on a beach in the coastal resort of Scheveningen, outside The Hague, for ceremonies which will be held Tuesday to mark the opening of parliament. The horses were exposed to smoke grenades and harsh sounds to reduce their chances of being startled by any incidents during the ceremony. (AP Photo/Peter Dejong)

Peter Dejong/AP

Smoke shrouds members of the Dutch cavalry as 80 riders rehearsed on a beach on Monday at Scheveningen, Netherlands, outside The Hague, for ceremonies to mark the opening of parliament on Tuesday.