CAREER BESTS
| Event | Time | Date | Site/Opponent |
| 50 Free | 25.60 | 1/26/13 | Navy Dual |
| 100 Free | 54.54 | 11/10/12 | Villanova Dual |
| 200 Free | 1:48.63 | 2/21/14 | Big Ten Championships |
| 500 Free | 4:53.65 | 12/5/13 | Texas Invitational |
| 100 Back | 56.87 | 12/6/14 | Georgia Fall Invite |
| 200 Back | 1:58.03 | 2/22/14 | Big Ten Championships |
| 200 IM | 2:06.40 | 2/18/16 | Big Ten Championships |
2015-16 (Senior Year)
Competed in nine different meets in six different events, primarily in the 200 backstroke … Narrowly missed achieving an NCAA ‘B’-cut at the Big Ten Championships in the 200 back, posting a season-best 1:59.24 to rank fourth on the team for the year … Also swam a season-best at Big Tens in the 200 free of 1:50.74 … Season-best in the 100 back of 58.40 came at the Georgia Invitational (12/5).
2014-15 (Junior Year)
Swam in seven meets competing in four different events, primarily seeing action in the 200 back ... Season-best time of 1:59.42 (Georgia Fall Invitational) in the 200 back ranked third on the team ... Set a personal best of 56.87 in the 100 backstroke at the Georgia Fall Invitational (12/5-7) ... Raced in the 200 free, 500 free and 200 back at the Big Ten Championships (2/18-21).
2013-14 (Sophomore Year)
Competed in five meets as well as the Big Ten Championships ... Named an Honorable Mention CSCAA Scholar All-American ... Notched a career-best time of 1:58.03 in the 200 back at the Big Ten Championships (2/22) ... Recorded a personal-best time of 1:48.63 in the prelims of the Big Ten Championships (2/21) ... Set career-best marks in the 500 free (4:53.65), the 100 back (57.45) and the 200 IM (2:07.15) at the Texas Invitational (12/5-7).
2012-13 (Freshman Year)
Competed in all nine meets during the season ... Swam the 200 free, 500 free and 200 back at the Big Ten Championships ... Posted a personal-best time of 1:50.32 in the 200 free at the Big Ten Championships (2/21-23) ... Claimed first place in the 200 back and 500 free at the Ohio State Invite (2/9-10) with personal-best times of 2:00.77 and 4:58.36, respectively ... Also turned in personal-best times in the 100 back and 200 IM at the Ohio State Invite, touching the wall in 58.18 and 2:08.13, respectively.
High School
Lettered all four years at Northwood High School for head coach Stephanie Vukovich ... Selected as team captain during her junior and senior seasons ... Named team MVP all four years for the Gladiators ... Was the school's first swimming state champion when she won the 100 backstroke and 200 freestyle at the 2012 Maryland Public Secondary School Athletic Association State Championships ... Also lettered twice in cross country ... Swam for the Rockville Montgomery Swim Club ... Was a junior national team member in 2012.
Personal
Full name is Chelsea Nicole Vanderweele ... Born in San Diego, California on May 28, 1994 ... Parents are David Vanderweele and Nancy Stuck ... Has one brother, Andrew, and one sister, Ashley ... Father, David, and mother, Nancy, both swam at Gannon University.