5 hot days so far, 28th of Helsinki's 56 summers.

Helsinki is compared against 1991-2020, not 1961-1990. This thermometer starts in 1971, so the earlier window every other city uses would cover only its warmer final years here, and a figure against that would look like every other city's while meaning something weaker. 1991-2020 is complete for this station, so it is the one shown. The count and the rank are measured on the full record and stand.

Hot here means 25.7 °C or above, a level about one summer day in twenty used to reach at this station between 1971 and 2000. The bar has not moved; the number of days clearing it has. Every year is counted to 8 August, so a part-finished summer is never set against complete ones. That threshold is Helsinki's own. It is not a national standard and it is not comparable with another city's: every figure on this page is measured against this station and nothing else.

The 20 °C night is a Mediterranean measure and Helsinki is outside its range. None this year, and nine nights in the whole of 1961-1990 by this date. No multiple is quoted, because dividing by a base that thin is arithmetic rather than evidence. 24 of the 42 cities are gated this way.

Helsinki's hottest day this year, 28.7 °C, is 17th on this record. The previous best is 33.2 °C in 2019, the dot on the drop line. A typical summer here peaks at 27.8 °C. Its hot-day count is 28th of 56: a count and a peak are different claims, and neither borrows the other's rank.

42 cities are measured this way, each against its own record. See them on the map