A rainbow appears in the sky, over buildings in Kiev, Ukraine, Saturday, July 11, 2015. (Photo by Evgeniy Maloletka/AP Photo)





In this photo taken on Wednesday, July 29, 2015, two rainbows are pictured over a valley near Kreuztal-Krombach, western Germany. (Photo by Joerg Taron/DPA via AP Photo)





A rainbow is pictured during stormy weather near Sehnde in the Hannover region, northern Germany, Sunday, March 29, 2015. (Photo by Julian Stratenschulte/AP Photo/DPA)





A rainbow forms over downtown Rome, Friday, March 27, 2015. (Photo by Alessandra Tarantino/AP Photo)





A rainbow forms near active sprinklers in Golden Gate Park in San Francisco, California April 6, 2015. (Photo by Robert Galbraith/Reuters)





U.S. President Barack Obama boards Air Force One to depart for Panama from Norman Manley International Airport in Kingston April 9, 2015. (Photo by Jonathan Ernst/Reuters)





A rainbow is seen on the Reloncavi Estuary at Cochamo town in the area of the Calbuco volcano, May 1, 2015. (Photo by Ivan Alvarado/Reuters)





A double rainbow is seen over buildings after rain in Bucharest, Romania May 3, 2015. (Photo by Radu Sigheti/Reuters)





A rainbow forms over an oilseed rape field in Heather, Britain May 5, 2015. (Photo by Darren Staples/Reuters)





A rainbow arcs over a residential street in Loughborough, Britain July 5, 2015. (Photo by Darren Staples/Reuters)





A rainbow is seen above the “Biryusa” international youth camp, located on the bank of the Yenisei River in the Taiga district outside the Siberian city of Krasnoyarsk, Russia, August 3, 2015. (Photo by Ilya Naymushin/Reuters)





An airplane flies past a rainbow at dusk in Beijing, China, August 3, 2015. (Photo by Reuters/Stringer)





A rainbow is seen in Hato Chami in the Ngabe-Bugle Region, Panama August 28, 2015. (Photo by Carlos Jasso/Reuters)





A double rainbow is seen above a row of terrace houses in Clapham, south London, Britain September 1, 2015. The second rainbow, above the main arc has the sequence of its colours reversed, with red on the inner side of the bow. (Photo by Dylan Martinez/Reuters)





A rainbow is seen over the Shard building in central London, Britain September 2, 2015. Photograph taken September 2, 2015. (Photo by Eddie Keogh/Reuters)





A rainbow is seen from Arthur Ashe Stadium ahead of the mens final between Roger Federer of Switzerland and Novak Djokovic of Serbia at the U.S. Open Championships tennis tournament in New York, September 13, 2015. (Photo by Lucas Jackson/Reuters)





A rainbow forms after a passing rain shower near Grants, New Mexico, October 5, 2015. (Photo by Lucas Jackson/Reuters)





Stunning rainbow was spotted in South East London, England shortly after the torrential rain September 1, 2015. (Photo by Velar Grant/ZUMA Press/Corbis)





A bird rests on a power line following a thundershower, Tuesday, September 15, 2015, in Hidalgo, Texas. (Photo by Eric Gay/AP Photo)





A surfer about to enter the water at Terrigal on the New South Wales Central Coast on September 23, 2015 in Sydney, Australia. (Photo by Tony Feder/Getty Images)





In this Saturday, April 25, 2015 photo, a rainbow is seen over a field with the Huayna Potosi mountain in the background as a bus drives by near Batallas, Bolivia. (Photo by Juan Karita/AP Photo)





A general view as a double rainbow forms overhead during a Melbourne Victory A-League training session at Gosch's Paddock on May 12, 2015 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)





A woman takes a photograph as a rainbow forms over the Harbour Bridge on a wet day in Sydney Wednesday, June 17, 2015. (Photo by Rick Rycroft/AP Photo)





A rainbow stretches across the Milan skyline, Italy, after heavy rain, Wednesday, September 23, 2015. (Photo by Luca Bruno/AP Photo)





Ypsilanti Community High School football players practice for the first game of the season against Pioneer High School, Tuesday, August 11, 2015, in Ypsilanti, Mich. (Photo by Dominic Valente/The Ann Arbor News via AP Photo)





A rainbow forms over tourists visiting Iguazu Falls in Foz do Iguazu, Brazil, on March 15, 2015. The waterfalls, on the border of Argentina and Brazil, are part of the Guarani Aquifer, one of the world's major underground reserves of fresh water. (Photo by Jorge Saenz/AP Photo)





A young woman walks in front of a rainbow in Behla, Germany, March 30, 2015. (Photo by Patrick Seeger/EPA)





Communist era apartment blocks are back dropped by a rainbow at sunset in Bucharest, Sunday, May, 3, 2015. The rainbow formed after a thunderstorm hit the Romanian capital in the late afternoon. (Photo by Vadim Ghirda/AP Photo)





A rainbow appears over the city on August 3, 2015 in Beijing, China. (Photo by Lintao Zhang/Getty Images)





Nat Young of the United States advanced to Round 3 of the JBay Open after winning his Round 2 heat on July 13, 2015 in Jeffreys Bay, South Africa. (Photo by Kelly Cestari/WSL via Getty Images)





Passersby take photos of a rainbow at sunset in Beijing, Monday, August 3, 2015. (Photo by Mark Schiefelbein/AP Photo)





This photo provided by Netflix/naturepl.com and WWF-International shows an African Elephant (Loxodonta africana) in front of double rainbow, in Masai Mara, Kenya, included in the Netflix natural history series, “Our Planet”, in collaboration with Silverback Films and WWF. The eight-part series debuts in 2019. (Photo by Andy Rouse/Naturepl.com/WWF-International/Netflix via AP Photo)