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17/3/2006

Length of growing season

Map showing the length of growing season

Map showing the length of the growing season in number of days and the proportion of the annual precipitation received during the growing season (blue line).

Growing season is defined as the part of year with daily mean temperatures above +5ºC. In spring this is the temperature where soil is sufficiently thawed for root activity to begin, and at the corresponding temperature in autumn growth cease.

The geographical variation, north to south, of the length of the growing season, in principle correspond to the variation in mean annual temperature. Timing of start and end of the growing season may vary locally in areas with similar length of the growing season. This is caused by the influence from large lakes and sea. These are slowly heated, thus cooling adjacent land areas in spring, and vice versa in autumn heating the same areas.

In Sweden there are normally large variations in weather and thus also in the timing of start and end of the growing season, because the prevailing winds most often are south-westerly. Influence is the largest in the southern parts of Sweden not sheltered by mountains. The large geographical differences in climate result in a growing season twice as long in the very south of Sweden compared to the northernmost parts. The influence of altitude is clear at the interior parts of southern Sweden with a growing season prominently shorter than in surrounding areas.

Compare with:

Last spring frostLink

 

Firs autumn frostLink

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