In its 31st week (8/6/2007), Star Trek: Enterprise peaked with a 0.9 household rating (up one-tenth from the week prior) and tied for 6th place on the network for the week. (SCI FI original series' ECW, Eureka and Flash Gordon led the week for SCI FI, with each earning a 1.5 rating). Looking at the network's other original series', Ghost Hunters had a 1.1 rating and Doctor Who had a 0.8 rating.
A few notes: Stargate SG-1 and Stargate Atlantis ended their seasons, which is why they aren't on the charts. Painkiller Jane wasn't on that week.
Also, the rating for Flash Gordon is for the series premiere. It was watched by 2.1 million viewers.
The four episodes which aired on that evening were: "Fallen Hero" (#23), "Desert Crossing" (#24), "Two Days and Two Nights" (#25) and "Carbon Creek" (#28).
Enterprise on SCI FI - Ratings to Date:
Week 01 (Episodes 01-04) - 1/08/2007 - 1.2 ("Fight or Flight")
Week 02 (Episodes 05-08) - 1/15/2007 - 1.1
Week 03 (Episodes 09-12) - 1/22/2007 - ?
Week 04 (Episodes 13-16) - 1/29/2007 - 0.9
Week 05 (Episodes 17-20) - 2/05/2007 - 1.0
Week 06 (Episodes 21-24) - 2/12/2007 - 1.0
Week 07 (Episodes 25-28) - 2/19/2007 - 1.0
Week 08 (Episodes 29-32) - 2/26/2007 - 1.2
Week 09 (Episodes 33-36) - 3/05/2007 - 0.8
Week 10 (Episodes 37-40) - 3/12/2007 - 0.9
Week 11 (Episodes 41-44) - 3/19/2007 - ?
Week 12 (Episodes 45-48) - 3/26/2007 - ?
Week 13 (Episodes 49-52) - 4/02/2007 - ?
Week 14 (Episodes 53-56) - 4/09/2007 - ?
Week 15 (Episodes 57-60) - 4/16/2007 - ?
Week 16 (Episodes 61-64) - 4/23/2007 - ?
Week 17 (Episodes 65-68) - 4/30/2007 - ?
Week 18 (Episodes 69-72) - 5/07/2007 - 1.0
Week 19 (Episodes 73-76) - 5/14/2007 - ?
Week 20 (Episodes 77-80) - 5/21/2007 - 0.9
Week 21 (Episodes 81-84) - 5/28/2007 - 1.1
Week 22 (Episodes 85-88) - 6/04/2007 - ?
Week 23 (Episodes 89-92) - 6/11/2007 - 1.1
Week 24 (Episodes 93-96) - 6/18/2007 - 1.1
Week 25 (Episodes 97-02) - 6/25/2007 - 1.0
Week 26 (Episodes 03-06) - 7/02/2007 - 1.0
Week 27 (Episodes 07-10) - 7/09/2007 - ?
Week 28 (Episodes 11-14) - 7/16/2007 - 1.0
Week 29 (Episodes 15-18) - 7/23/2007 - ?
Week 30 (Episodes 19-22) - 7/30/2007 - 0.8
Week 31 (Episodes 23-25,28) - 8/06/2007 - 0.9
Here is the chart via SCI FI Wire (click to enlarge):

A few notes: Stargate SG-1 and Stargate Atlantis ended their seasons, which is why they aren't on the charts. Painkiller Jane wasn't on that week.
Also, the rating for Flash Gordon is for the series premiere. It was watched by 2.1 million viewers.
The four episodes which aired on that evening were: "Fallen Hero" (#23), "Desert Crossing" (#24), "Two Days and Two Nights" (#25) and "Carbon Creek" (#28).
Enterprise on SCI FI - Ratings to Date:
Week 01 (Episodes 01-04) - 1/08/2007 - 1.2 ("Fight or Flight")
Week 02 (Episodes 05-08) - 1/15/2007 - 1.1
Week 03 (Episodes 09-12) - 1/22/2007 - ?
Week 04 (Episodes 13-16) - 1/29/2007 - 0.9
Week 05 (Episodes 17-20) - 2/05/2007 - 1.0
Week 06 (Episodes 21-24) - 2/12/2007 - 1.0
Week 07 (Episodes 25-28) - 2/19/2007 - 1.0
Week 08 (Episodes 29-32) - 2/26/2007 - 1.2
Week 09 (Episodes 33-36) - 3/05/2007 - 0.8
Week 10 (Episodes 37-40) - 3/12/2007 - 0.9
Week 11 (Episodes 41-44) - 3/19/2007 - ?
Week 12 (Episodes 45-48) - 3/26/2007 - ?
Week 13 (Episodes 49-52) - 4/02/2007 - ?
Week 14 (Episodes 53-56) - 4/09/2007 - ?
Week 15 (Episodes 57-60) - 4/16/2007 - ?
Week 16 (Episodes 61-64) - 4/23/2007 - ?
Week 17 (Episodes 65-68) - 4/30/2007 - ?
Week 18 (Episodes 69-72) - 5/07/2007 - 1.0
Week 19 (Episodes 73-76) - 5/14/2007 - ?
Week 20 (Episodes 77-80) - 5/21/2007 - 0.9
Week 21 (Episodes 81-84) - 5/28/2007 - 1.1
Week 22 (Episodes 85-88) - 6/04/2007 - ?
Week 23 (Episodes 89-92) - 6/11/2007 - 1.1
Week 24 (Episodes 93-96) - 6/18/2007 - 1.1
Week 25 (Episodes 97-02) - 6/25/2007 - 1.0
Week 26 (Episodes 03-06) - 7/02/2007 - 1.0
Week 27 (Episodes 07-10) - 7/09/2007 - ?
Week 28 (Episodes 11-14) - 7/16/2007 - 1.0
Week 29 (Episodes 15-18) - 7/23/2007 - ?
Week 30 (Episodes 19-22) - 7/30/2007 - 0.8
Week 31 (Episodes 23-25,28) - 8/06/2007 - 0.9
- "Fallen Hero", "Desert Crossing", "Two Days and Two Nights" and "Carbon Creek".
Here is the chart via SCI FI Wire (click to enlarge):
