The expected number of deaths is a 4 month average of the number of non-winter deaths: deaths in the two four month periods which precede winter (August to November) and follow winter (April to July).
The number of deaths can vary depending on the season and in particular tend to increase in the winter. This section presents Excess Winter Mortality: the difference between the actual number of winter deaths in the 4 month period December to March and the expected number of deaths.
