Wilder's Cobblers are 13 points clear at the top of the table and last month shone during a busy period with 16 points from a possible 18.
"February was a hectic schedule for us as a football club, and on and off the pitch we achieved great results in that period," said Wilder.
"We had some tough games against teams in and around us, there was a lot of travelling as well, so it is testament to the preparation from everybody, the coaching staff and the professionalism of the players that we got the results we did."
Fewster, who is on loan from Middlesbrough, scored five goals in as many games for the Minstermen.
"I'm just glad to have been able to score regularly," Fewster said. "I was always confident I could score at this level and I'm just happy I've been able to show that."
Despite Fewster's goals last month, York are in the bottom two and five points from safety.