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Interesting situation of warm water apparently being moved downstream form lake to lake. To add to this, Lake Superior runs 37-40 deg.F (depending on whose guage) in the east end of the lake, with surface temp. about 60 F in August. Also there are thermoclines at about 60-90 feet depending on weather. I have not been in the western part of this lake but am told the surface temp. is not much above the deep temp in the summer. Anyone have more info on this? Sam Frushour On Fri, 29 Sep 1995 gmcgee1@fo*.co* wrote: > Rod, > > The water temperature in Lake Michigan and lake Ontario are warmest during > August to Early September (just before the cold north winds start to blow). > The surface temp. might get as warm as 60-65 degress F. off shore > and even warmer in the shallow (beach) swimming area's near shore. > > During any given time period Lake Ontario can be warmer then Lake Michigan. > This is because as water flows from Lake Superior down thur the remaining > lakes during the summer months it will carry this warmer water along the way. > > This is why you can find The Lake St. Clair warmer then Lake Huron, Lk. Erie > warmer then Lk, St. Clair, Lk. Ontario warmer than Lk. Erie ...etc. > > All my dive are done in a DUI TLS-350 Dry suit. I don't look at my temp. gauge > very much. As long as I'm warm during my dive I really don't care what the > temperature is. > > On a given summer (July, August, Early September) day you can find the > following off shore temperature. Please keep in mind these are guestimations. > > Suface: approx. 65 degrees F. > 8' - 20' approx. 60 - 65 degrees F. > 21' - 45' approx. 55 - 60 degrees F. > 46' - 60' approx. 50 - 55 degrees F. > 61' - 80' approx. 45 - 50 degrees F. > > deeper than 80 feet I've never known it to get warmer then 45. most time it's > more like 40 degrees. At 100' you are looking at 37-38 degrees at best. On > deeper diver (in the 200' range) I've never seen it colder than 36 degrees f. > > The above chart is to give you some idea of the temperature. On most dives > you will find large jumps in temperature called thermoclines (sp?). For > example you might enter the water it's 65 d/f. then at 20 - 25' it drops > to 50 d/f, then at 80' it drops to 40 d/f. and it only gets colder from > there. Mother nature is cold hearted up here in the Fresh Water Sea, Country. > > We offen called the Great Lakes challenge: Deep, Dark, and Cold. > > How about it are there any other Great Lakes Diver who can share some info? > > Gary McGee > Detroit, MI USA > Greate Lakes Wrecker > > > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. >
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