Global Lake and River Ice Phenology

Freeze/Thaw Dates Search

Retrieve freeze dates, thaw dates, and ice duration for a collection of the world's lakes and rivers. The physical characteristics of the lakes and rivers in the database (such as lake area, depth, and elevation) can be found on the Physical Characteristics Search page. Search tips are available in the documentation.

Geographical Regions

Choose a region by country or enter a specific latitude and longitude.

By Country:

Latitude and Longitude:
North (Max: +82.50)
West (Min: -140.40) East (Max: +149.30)
South (Min: +36.15)

Lake/River Properties

Optional parameters to search by lake or river name and filters to search for only lakes or rivers and the freeze status of the water body.

Lake or River Name:

Name Code:
(uniquely identifies lakes or rivers with the same name)

Lake and/or River:

Lake Only
River Only
Either Lake or River

Freeze status:
(returns records depending on whether or not the lake or river froze)

Did Freeze
Did not Freeze

Year Range (yyyy)

Minimum Year:   (Min: 874)

Maximum Year

Output Parameter Options

Choose the parameters you wish to output for each lake or river.

Ice On Date (yyyy,mm,dd)
Ice Off Date (yyyy,mm,dd)
Ice Duration (ddd: number of days)
Season (yyyy-yy: fall year-spring year)
Frozen (Y/N whether or not lake or river froze)
Lake Name
Name Code
Lake or River
Country Name

Output Sort Options

Choose which parameter you would like the data sorted by.
(Default is unsorted)

Ice Duration
Ice Season
Lake Name
Lake or River (lakes, then rivers)
Country Name

Output Format Options

Choose the format in which you would like to receive the data.

Gzipped CSV file (comma-separated)
TSV ASCII file (tab-separated)