Her longest running role was on Breakfast Television in Toronto for 23 years where she went from being a weather specialist to hosting the "Live Eye" and being the stand in co-host.

Valentyne graduated from David and Mary Thomson Collegiate Institute[1] and earned a Radio and Television Broadcasting Diploma from Toronto's Centennial College.

In 1992 she became a regular as the "Singing Weathergirl" on Breakfast Television, where she worked doing "Live Eye" segments and as a fill-in co-host until her position was eliminated in April 2016.

[9] In May 2022, Valentyne announced, through a video posted to social media, that she had filed a complaint with the Canadian Human Rights Commission (CHRC) alleging gender discrimination by a previous employer.

[10] Corus subsequently acknowledged that it was party to a process involving Valentyne and the CHRC, and announced that it had put Derringer in the Morning on hiatus pending the results of an external investigation.