When can we wear our springsuits?

Average Ocean Water Temperatures in San Diego
January: 57
February: 57
March: 58
April 1-15: 59
April 16-30: 60
May 1-15: 61
May 16-31: 62
June 1-15: 63
June 16-30: 65
July 1-15: 66
July 16-31: 67
August 1-15: 69
August 16-31: 69
September 1-15: 67
September 16-30: 66
October 1-15: 65
October 16-31: 63
November: 61
December: 59

This is from noaa's data. Spring might be a misnomer, our water sometimes does not warm up until well into June then we are wearing trunks in October. However I remember several April's where it was time to lose the 4-3 and go to a spring suit.