[Pete Roberts]

River Weaver, Frodsham, 23-7-10: 22.5C

Pete

[Pete Roberts]

River Weaver, Frodsham, Cheshire, 27-7-10: 21.5C

Pete

[Pete Roberts]

River Ouzel, Willen Road Bathing Place, Newport Pagnell, 30-7-10: 19C

To avoid any confusion, Ouzel is the "official" name of the river as given on OS maps, however the locals know it by its older name: the Lovat. The river is a tributary of the Great Ouse.

Pete

[PK2]

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Pete Roberts - 19/7/2010 21:39

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PK2 - 19/7/2010 16:31 Curious the rivers around Frodsham are warmer that those in Leicester. I'd have thought river temps would be warmer in the east ATM given the past few weeks of cloud and rain (at least along the coast into Wales)

Depends on the source.  Many rivers are fed from springs but others, such as Cheshire's R. Weaver,  are fed by surface water which in summer is much warmer.

 Pete

Thanks Pete. Would the opposite would true in winter with spring fed ones being warmer?

[Pete Roberts]

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PK2 - 31/7/2010 06:24  Thanks Pete. Would the opposite would true in winter with spring fed ones being warmer?

Yes, theoretically as water issuing from a spring will usually be around 10C all year round.  However increased rainfall/snowmelt during winter may lower the actual temperature as in flood conditions the amounts of surface water will far exceed that from the source.  Assuming this coming winter to be an average one I may be able to record temperatures of Southern rivers in non-flood states.

Pete

[Pete Roberts]

Hatchmere, Delamere, Cheshire (Lake) 1-8-10: 20C

Pete

[rosskesava]

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Pete Roberts - 1/8/2010 22:30 Hatchmere, Delamere, Cheshire (Lake) 1-8-10: 20C Pete

How comes it's cooler than during June by 3C (as per your first post on this thread)? Is it anything to do with the lousy summer you've been having up there?

Ok, I know it's probably a daft question..... 

Cheers

[Pete Roberts]

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rosskesava - 1/8/2010 22:38

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Pete Roberts - 1/8/2010 22:30 Hatchmere, Delamere, Cheshire (Lake) 1-8-10: 20C Pete

How comes it's cooler than during June by 3C (as per your first post on this thread)? Is it anything to do with the lousy summer you've been having up there?

Ok, I know it's probably a daft question..... 

Cheers

In a word, yes.  R. Ouzel in Newport Pagnell also down by 2C since early July.  Bear in mind though it's not just lower air temperatures and lack of sunshine but  also large quantities of comparatively cold rain entering water bodies.  I'm swimming the Dee in Chester tomorrow so will be interesting to see what the water temp is.  I'm taking a guess it'll be 18-20C.

 Pete

[Pete Roberts]

River Dee, Chester, 2-8-10: 19C

Just about within the norm for the time of year (Should be 20-21C).

Pete

[PK2]

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Pete Roberts - 31/7/2010 10:00

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PK2 - 31/7/2010 06:24  Thanks Pete. Would the opposite would true in winter with spring fed ones being warmer?

Yes, theoretically as water issuing from a spring will usually be around 10C all year round.  However increased rainfall/snowmelt during winter may lower the actual temperature as in flood conditions the amounts of surface water will far exceed that from the source.  Assuming this coming winter to be an average one I may be able to record temperatures of Southern rivers in non-flood states.

Pete

Thanks.
IF they've got their figures correct (e.g. are not measuring temps much lower down the water column) it seems Loch Ness is only 5-7C. Does that seems likely?

[Pete Roberts]

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PK2 - 5/8/2010 06:30  Thanks. IF they've got their figures correct (e.g. are not measuring temps much lower down the water column) it seems Loch Ness is only 5-7C. Does that seems likely?

No - that's journalistic licence tending to utter nonsense.  I swam in Loch Ness in early September and the surface water temp was 18C - a long way from 6-7C which is what I'd expect in winter.

Bear in mind that Ness is situated at the bottom of the Great Glen at virtually sea level.

Pete

[PK2]

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Pete Roberts - 5/8/2010 09:12

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PK2 - 5/8/2010 06:30  Thanks. IF they've got their figures correct (e.g. are not measuring temps much lower down the water column) it seems Loch Ness is only 5-7C. Does that seems likely?

No - that's journalistic licence tending to utter nonsense.  I swam in Loch Ness in early September and the surface water temp was 18C - a long way from 6-7C which is what I'd expect in winter.

Bear in mind that Ness is situated at the bottom of the Great Glen at virtually sea level.

Pete

Cheers, I suspected they quoted the coldest possible temperature in the Loch without thinking that the swimmers are unlikely to be swimming at that depth but would be more likely to swim somewhat closer to the surface ;) . I did wonder how much sun it gets though and might have expected it to be a little colder than 18C.

[Pete Roberts]

River Biam, Aylestone Meadows, Leicester, 5-8-10: 17C

A fellow swimmer, an expert on wildlife, was very concerned to find an American signal crayfish wandering about the river bed. Apparently these are Very Bad News particularly as they are now making their way north.

Meanwhile this was my view of the river.

Pete

[PK2]

Just by way of comparison the inshore sea-water temp here seems to be about 16C.

[Pete Roberts]

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PK2 - 7/8/2010 10:55 Just by way of comparison the inshore sea-water temp here seems to be about 16C.

According to CEFAS Smartbuoy current SST in Liverpool Bay is 17C - the long term average is 18C.

 River Weaver, Frodsham, Cheshire, 7-8-10: 21C.

About right for the time of year.  This is my local (and usual) swimming spot.

 Pete

[PK2]

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Pete Roberts - 7/8/2010 18:15

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PK2 - 7/8/2010 10:55 Just by way of comparison the inshore sea-water temp here seems to be about 16C.

According to CEFAS Smartbuoy current SST in Liverpool Bay is 17C - the long term average is 18C.

 River Weaver, Frodsham, Cheshire, 7-8-10: 21C.

About right for the time of year.  This is my local (and usual) swimming spot.

 Pete

[dunno] IIRC it felt cooler near the point I could most easily take the reading ;) but maybe my thermo lacks accuracy .:( .

[Pete Roberts]

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PK2 - 8/8/2010 08:46 [ [dunno] IIRC it felt cooler near the point I could most easily take the reading ;) but maybe my thermo lacks accuracy .:( .

I forgot to mention the Smartbuoy is located at the Mersey bar.  Water temp in the Irish Sea isn't uniform and your measuring point could well have been significantly cooler.

Pete

[PK2]

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Pete Roberts - 8/8/2010 09:19

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PK2 - 8/8/2010 08:46 [ [dunno] IIRC it felt cooler near the point I could most easily take the reading ;) but maybe my thermo lacks accuracy .:( .

I forgot to mention the Smartbuoy is located at the Mersey bar.  Water temp in the Irish Sea isn't uniform and your measuring point could well have been significantly cooler.

Pete

true but then my measuring point was close inshore so might have been warmer [dunno] . Still not convinced about my thermo though

[Pete Roberts]

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PK2 - 8/8/2010 09:27  true but then my measuring point was close inshore so might have been warmer [dunno] . Still not convinced about my thermo though

You can check the calibration the way I do mine: use the bulb/probe to stir a slush of water and crushed ice. Should give you a reading of 0C. No need to check the upper fixed point (100C) for measuring outdoor water temps.

Pete

[Pete Roberts]

Hatchmere (lake), Delamere Forest, Cheshire, 8-8-10: 20C

Pete