Spring tides occur during the full moon and the new moon when the earth, moon and sun are in line, creating a stronger force of attraction. Using tidal coefficients, professionals and amateurs alike can predict the size of the tide and thus avoid being taken by surprise when the tide comes in.
This "scale" runs from 20 (lowest neap tide) to 120 (equinoctial spring tide). Spring tides are those with a coefficient of 95 or more.

January 2012
     Tuesday, January 24, 2012 - coefficients 95/96
     Wednesday, January 25, 2012 - coefficients 96/95

February 2012
     Wednesday, February 8, 2012 - coefficient 98
     Thursday, February 9, 2012 - coefficients 101/103
     Friday, February 10, 2012 - coefficients 104/104
     Saturday, February 11, 2012 - coefficients 102/99
     Sunday, February 12, 2012 - coefficient 95
     Wednesday, February 22, 2012 - coefficient 95

March 2012
     Thursday, March 8, 2012 - coefficients 99/105
     Friday, March 9, 2012 - coefficients 108/111
     Saturday, March 10, 2012 - coefficients 112/112
     Sunday, March 11, 2012 - coefficients 110/106
     Monday, March 12, 2012 - coefficient 101

April 2012
     Thursday, April 5, 2012 - coefficient 95
     Friday, April 6, 2012 - coefficients 101/106
     Saturday, April 7, 2012 - coefficients 110/113
     Sunday, April 8, 2012 - coefficients 114/113
     Monday, April 9, 2012 - coefficients 110/106
     Tuesday, April 10, 2012 - coefficient 101

May 2012
     Saturday, May 5, 2012 - coefficients 97/102
     Sunday, May 6, 2012 - coefficients 106/108
     Monday, May 7, 2012 - coefficients 109/108
     Tuesday, May 8, 2012 - coefficients 106/103
     Wednesday, May 9, 2012 - coefficient 98

June 2012
     Monday, June 4, 2012 - coefficients 97/100
     Tuesday, June 5, 2012 - coefficients 102/102
     Wednesday, June 6, 2012 - coefficients 101/100
     Thursday, June 7, 2012 - coefficient 97

July 2012
     Wednesday, July 4, 2012 - coefficients 96/98
     Thursday, July 5, 2012 - coefficients 99/99
     Friday, July 6, 2012 - coefficients 97/95

August 2012
     Thursday, August 2, 2012 - coefficient 97
     Friday, August 3, 2012 - coefficients 98/99
     Saturday, August 4, 2012 - coefficients 98/97
     Saturday, August 18, 2012 - coefficient 95
     Sunday, August 19, 2012 - coefficients 97/98
     Monday, August 20, 2012 - coefficients 99/98
     Tuesday, August 21, 2012 - coefficient 97
     Friday, August 31, 2012 - coefficient 95