NOAA's National Climatic Data Center (NCDC) and Environment Canada both gather data on wind speed, air temp, cloud cover and other meteorological variables derived from hundreds of stations across the Great Lakes Basin. Statistical weighting procedures are implemented (i.e. Theissen Weighting) by GLERL to come up with the best possible measurement (or areal average) of targeted variables.
All these data are used in the computation of higher level hydroclimate variables, most critically evaporation (see this for more detail).
Click here to view the latest data from GLERL's Great Lakes Monthly Hydrologic Database (further info).
We provide plotting of time series of major global climate oscillation and pattern indices for comparison with other variables related to the Great Lakes. More information about these data along with up-to-date data can be found via the following links: