The in-swim water temperature out at L1 came in at an even 40.0F yesterday – right at the border of the “basement” – a.k.a. anything in the 30Fs. Technically, the surface temperature came in below 40F, but that was likely due to a 38F air temperature that was distorting the reading.
The lake had some slight swells and chops, but I got in my usual 1/4 mile before engaging in the mad post-swim scramble to get dressed before the dreaded afterdrop arrived. Luckily for me, I managed to secure a rock star parking spot just on the other side of the pedestrian tunnel. So it was a very quick dash from L1 back to the paradise of a heated automobile!