National Weather Service United States Department of Commerce

Select a river to plot breakup dates:

  1. Select a region
  2. Then select a river
  3. Then select a location
Statistically significant trends evaluated using the t-test at the 95% confidence level.
Click on the chart to select a different date range.
Shaded Region
Statistics
(dates based on non-leap year)
Start Year
End Year
Number
Min.
Median
Max.
IQR
days
Click on a datapoint to remove it from the statistical calculation

Breakup Dates Table