Arizona residents often welcome the start of November because it means an end to 100-degree temperatures. But Ray Black is still bringing triple-digit heat.

The Giants’ right-handed prospect is the talk of the Arizona Fall League, in which teams send many of their most promising players for additional seasoning. His fastball has topped out at 104 mph. The only other player, majors or minors, to throw a pitched measured that fast in the past five years is Cincinnati Reds closer Aroldis Chapman.

When Black enters a game, players line the rails of both dugouts and fans nearby the scouts section peer at the radar guns like they’re watching a viral video.

Black, 25, was a seventh-round draft pick in 2011 out of the University of Pittsburgh but didn’t throw his first professional pitch for three years as he recovered from a series of arm injuries. He made 20 appearances for Single-A San Jose last season (opponents batted .153 against him), and with more consistent mechanics, the Giants hope he’ll be durable enough to throw on consecutive days next season.

“To me it’s not just the velocity,” Giants farm director Shane Turner said. “It’s the angle and the finish on the ball. When he’s right, he makes 100 look like 115.”

Black also throws a promising curveball, Turner said.

“He’s on the mound and he throws one at 98 mph,” said Turner, “and our pitching coordinator, Bert Bradley, said, `Oh, that’s his changeup.'”