Onset of spring starting earlier across the Northern Hemisphere

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Additional and enhanced graphics related to this article

Annual average temperature trends by station 1961-2000 (gif)

Spring average temperature trends by station 1961-2000 (gif)

Summer average temperature trends by station 1961-2000 (gif)

Autumn average temperature trends by station 1961-2000 (gif)

Winter average temperature trends by station 1961-2000 (gif)

Autumn first -2.2ºC freeze date trends by station 1961-2000 (gif)

Spring indices winter chill date trends by station 1961-2000 (gif)

Figure 1, Spring indices first leaf date trends by station 1961-2000 (gif)

Figure 2, Spring indices first leaf date trend for the NH, 1955-2002 (jpg)

Spring indices first bloom date trends by station 1961-2000 (gif)

Spring indices first bloom date trend for the NH, 1955-2002 (jpg)

Figure 3, Spring last -2.2ºC freeze date trends by station 1961-2000 (jpg)

Figure 4, Last -2.2ºC freeze date trend for the NH, 1955-2002 (jpg)

Spring 5ºC "permanent crossing" date trends by station 1961-2000 (gif)

Spring 5ºC "permanent crossing" date trend for the NH, 1955-2002 (jpg)

5ºC "growing season" length trends by station 1961-2000 (gif)

5ºC "growing season" length trend for the NH, 1955-2002 (jpg)

-2.2ºC freeze period length trends by station 1961-2000 (gif)

Figure 5, Spring "damage index" trends by station 1961-2000 (gif)