In-water temperature gradient. What's the biggest delta you've experienced?

[rhwestfall]

We get to deal with all of it (blue line is temp):

In the Lake:
90 air, 75 surface water, 42 @ depth:

In the River:
72 air, 65 water, all the way to 120':

here's a "funny one" where it got warmer in the water (PDC was in an A/C room right before we splashed - dive was in Jamaica):

 

[Wookie]

85 on the surface of the Wilkes Barre, 53 at 200 feet. I aborted in my rash guard and board shorts.

 

[MXGratefulDiver]

I don't know if it was the biggest, but certainly dramatic ... diving the Numidia at Brothers in the Red Sea. Temps above 160 feet were between 78 and 81 degrees F. At 160 feet the water temp rather suddenly dropped to 63 degrees ... a bit chilly for the 3mm wetsuit I was wearing at the time. I didn't stay long ...

... Bob (Grateful Diver)

 

[wetb4igetinthewater]

Hood Canal in Washington state when there has been good weather and good tides. Last Fourth of July, 84 degrees F at the surface, 43 degrees F 25 feet down.

 

[ajduplessis]

Surface 34c (93f) top water temp 22c (71f) and 14c (57f) bottom. This is into a mine (cave).

 

[uncfnp]

Second week of August 2013 in West Palm Beach, Florida. Air temp upper 80's. Water temp first 12 feet mid 80's. 64 degrees at 80 feet.

 

[Kharon]

Lake George - surface 69°F, 60 feet or so (2nd thermocline) 43°F. Bonaire - from surface to 120 feet 79° at 125 feet 75°. You could feel and see the thermocline. One dive only - never saw that again.

 

[gcarter]

Morrison's Quarry.Temperature dropped to 3.9C (39F) @ 120' from 18C (64.4F) at the surface.

 

[CT-Rich]

Small like in Connecticut. Mid 70s on the surface mid 40s at 40 ft

 

[durgaprasadzone]

Thanks for info