Why are coastal summer overnight lows in NoCal so low?

[Joe90]

Originally Posted by nei

With no breeze even spots near the ocean can cool a lot overnight. The west coast rarely gets completely still nights so that may also explain the difference

Looks like the case with Wellington, where the sea temperature is 1.2C cooler than here, but the summer minimums are 2.6C warmer. With the Cook Strait, I'd think Wellington doesn't get many still nights.

[nei]

Originally Posted by Joe90

Looks like the case with Wellington, where the sea temperature is 1.2C cooler than here, but the summer minimums are 2.6C warmer. With the Cook Strait, I'd think Wellington doesn't get many still nights.

coastal California is still windiest at midday, but the nights are usually still have a light breeze.