2014

  • The average ice out date is April 28th.

  • The average ice-out date has varied by decades:

    1920's
    May 2
    1930's
    April 28
    1940's
    April 25
    1950's
    May 2
    1960's
    May 2
    1970's
    May 2
    1980's
    April 26
    1990's
    April 29
    2000's
    April 26
    2010's
    April 27


  • The earliest ice-out was April 2, 2012. The latest was May 23, 1950.

  • The ice has never gone out on April 15th. (Too taxing!)

  • The percentage (rounded) of time the ice will go out on the following dates:

    (2012 data-the percentages do not change significantly year to year.
    Plans are to update the percentages every 3 to 5 years.)

    Before April 5 .39%
    April 6 .15%
    April 7 .19%
    April 8 .26%
    April 9 .37%
    April 10 .43%
    April 11 .54%
    April 12 .68%
    April 13 .91%
    April 14 1.03%
    April 15 1.23%
    April 16 1.46%
    April 17 1.70%
    April 18 2.17%
    April 19 2.28%
    April 20 2.56%
    April 21 2.87%
    April 22 3.44%
    April 23 3.45%
    April 24 3.70%
    April 25 3.91%
    April 26 4.49%
    April 27 4.26%
    April 28 4.34%
    April 29 5.18%
    April 30 3.58%
    May 1 4.69%
    May 2 4.17%
    May 3 4.01%
    May 4 3.80%
    May 5 3.87%
    May 6 3.28%
    May 7 2.99%
    May 8 2.70%
    May 9 2.62%
    May 10 2.10%
    May 11 1.82%
    May 12 1.57%
    May 13 1.33%
    May 14 1.21%
    May 15 .91%
    May 16 .74%
    May 17 .60%
    May 18 .52%
    May 19 .37%
    May 20 .29%
    May 21 .22%
    May 22 .17%
    May 23 and after .22%


  • The National Climatic Data Center and international standards require that climate "normals" (averages) be based on 30 year records. Thus, the "normals" from 1971 to 2000 are updated for years 1981 to 2010. The following table indicates "ice-out" trends using this standard on "ice-out" dates:

    Years
    Ave. Ice-Out Date
    Earlier/Later*
    By Time**
    1923-1950
    April 29
    na
    na
    1931-1960
    April 28
    Earlier
    2 hr. 3 min.
    1941-1970
    April 30
    Later
    32 hr. 0 min.
    1951-1980
    April 30
    Later
    19 hr. 12 min
    1961-1990
    April 29
    Earlier
    32 hr. 0 min.
    1971-2000
    April 28
    Earlier
    27 hr. 12 min.
    1981-2010
    April 27
    Earlier
    24 hr. 15 min.
    * Earlier or later than previous 'ice-out' period.
    ** Earlier or later by time from previous period (these times are relative, not absolute 'ice-out' times, and are presented for comparison purposes only. The average 'ice-out' time for all recorded years is 17 hours, 6 min. into the April 28th 24 hour clock.


© January, 2014 by: Iceman