Photo: The Canadian Press

Firefighters and police officers view a burning wildfire, Sunday, Oct. 15, 2017, in Oakville, Calif. With the winds dying down, fire officials in California say they are finally getting the upper hand against the wildfires that have devastated wine country and other parts of the state over the past week. (AP Photo/Marcio Jose Sanchez)

With the winds dying down, fire officials said Sunday they have apparently "turned a corner" against the wildfires that have devastated California wine country and other parts of the state over the past week, and thousands of people got the all-clear to return home.

While the danger from the deadliest, most destructive cluster of blazes in California history was far from over, the smoky skies started to clear in some places.

"A week ago this started as a nightmare, and the day we dreamed of has arrived," Napa County Supervisor Belia Ramos said.

People were being allowed to go back home in areas no longer in harm's way, and the number of those under evacuation orders was down to 75,000 from nearly 100,000 the day before.

Fire crews were able to gain ground because the winds that had fanned the flames did not kick up overnight as much as feared.

"Conditions have drastically changed from just 24 hours ago, and that is definitely a very good sign," said Daniel Berlant, spokesman for California Department of Forestry and Fire Protection, who noted that some of the fires were 50 per cent or more contained. "It's probably a sign we've turned a corner on these fires."

The blazes were blamed for at least 40 deaths and destroyed some 5,700 homes and other structures. The death toll could climb as searchers dig through the ruins for people listed as missing. Hundreds were unaccounted for, though authorities said many of them are probably safe but haven't let anyone know.

In hard-hit Sonoma County, Sheriff Rob Giordano said authorities have located 1,560 of the more than 1,700 once listed as missing. Many of those names were put on the list after people called from out of state to say they couldn't reach a friend or relative.

Sonoma County officials said they will not let people return home until it is safe and utilities are restored. Crews have been working around the clock to connect water and power, in some cases putting up new poles next to smouldering trees, the sheriff said.