At least 15 people were killed after heavy rain and flooding battered China's northern province of Shanxi, destroying thousands of homes and forcing more than 120,000 people to relocate to safer areas, local officials said Tuesday.

The province experienced its worst flooding this month since records began, meteorological official Wang Wenyi said at a news conference Tuesday, adding the province's average rainfall in October was 13 times that of the same period in a normal year.

At least 1.75 million people have been affected by the flooding, which has caused at least 19,500 houses to collapse and seriously damaged another 18,200 homes, local emergency management official Wang Qirui said at the news conference.

Three people remain missing, Wang Qirui added.

According to Wang Qirui, the heavy rainfall and floods have caused an estimated direct economic loss of more than 5 billion Chinese yuan ($775 million) in the province.

The heavy rains also forced the closures of 60 coal mines in Shanxi, according to a statement released Saturday by the provincial government's Emergency Management Bureau. Shanxi is China's largest coal mining hub, accounting for a quarter of the country's coal production.

Provincial authorities have already earmarked 50 million yuan (about $7.7 million) to support flood control and relief work, state media CCTV reported.

This isn't the first time this year that China has been hit by devastating floods.More than 300 people died after record rainfall hit central China in July, submerging entire neighborhoods in Zhengzhou, the provincial capital of Henan province, and leaving passengers trapped in subway cars.

At the time, Zhengzhou's weather station called it a "once in a thousand years" downpour, while Henan's water resources department went a step further, claiming rain levels recorded at some stations could only be seen "once every 5,000 years."

Scientists say climate change is making extreme flooding worse -- and warn the number of people at risk from extreme flooding has grown significantly.