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The health calendar
Twelve pages, one per month: daylight and vitamin D, seasonal produce, pollen, tick and flu season, and the health task of the month — written for the north (Estonia, Finland, Latvia).
| Month | Daylight | Pollen | The health task |
|---|
The shape of the year
The northern year has a rhythm the body follows whether or not the calendar does: light climbs from January to June and falls back, vitamin D follows the sun angle, and the risk seasons — pollen, ticks, flu — take turns. Most of the year's health decisions have a month when they are cheap and a month when they are expensive: the flu shot in October costs nothing in December terms, and the sleep routine fixed in September carries the winter. The month pages exist to put those decisions on the calendar.
Sources: Finnish Meteorological Institute — seasons and daylight · University of Turku Aerobiology Unit — Finnish pollen season calendar · ECDC — seasonal influenza · Terviseamet (Estonian Health Board) — tick-borne disease guidance · checked 2026-09-07