It's better to sand in the 40's than in the high 50's.

Sanding to "get the red out".
Sanded the port side bow and starboard side bow to remove the remaining red bottom paint along the waterline, on the front surface of the keel, and on the starboard side worked aft to abaft the forward jackstand.

before today's sanding.
after today's sanding, after rinsing away the sanding dust.