Lake ice clearance and formation data for Green Lakes Valley, 1968 - ongoing.

Records were based on intermittent observation of the extent of ice cover on Silver Lake, Lake Albion, and Green Lakes 1-5, dependent on observers present for other reasons (or in some cases from photos or satellite data). Dates of freeze-up (formation), breakup (first melt or open water), and lake-ice clearance were recorded, along with visual estimates of percent ice cover at various dates prior to complete meltout in spring. The latter estimates are only included starting in 2019.

记录基于对Silver Lake、Lake Albion及Green Lakes 1-5冰盖范围的间歇观测，观测依赖于因其他原因在场的观察者（或在某些情况下基于照片或卫星数据）。记录内容包括结冰期（形成）、融冰期（首次融化或出现开阔水域）及湖冰完全消融的日期，同时还涵盖春季完全融化前不同日期的冰盖覆盖率目视估算值。后者的估算值仅从2019年起被纳入记录。