Table 2 Minimum, mean, and maximum lengths of thermal seasons from 1974 to 2010 by study area

Winter T < 0 °C

Oulu_{65N, 25E}

Jyväskylä_{62N, 25E}

Helsinki_{60N, 24E}

Spring T = 0° − 10 °C

Oulu_{65N, 25E}

Jyväskylä_{62N, 25E}

Helsinki_{60N, 24E}

Summer T > 10 °C

Oulu_{65N, 25E}

Jyväskylä_{62N, 25E}

Helsinki_{60N, 24E}

Autumn T = 10° − 0 °C

Oulu_{65N, 25E}

Jyväskylä_{62N, 25E}

Helsinki_{60N, 24E}