Snow cover data are derived from NOAA satellite imagery. The strongest response occurs during the winter season following the onset of the events. Precipitation values weaken considerably in the following seasons. The numbers indicate degrees Celsius by which the temperature departs from normal. The animation steps through the data in 10-day increments.
Values shown are departure from normal in millimetres.
The animation steps through the data in 10-day increments. Risk of extreme weather during La Nina. Insufficient data over gray shaded areas. Some of the material on this page originates with organizations not subject to the Official Languages Act and is only available in the language in which it was written. An index used to determine the duration and intensity of winter cold.