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    When does spring begin? The answer depends on who you ask. A meteorologist would answer 1 March. An astronomer would answer 20 March. But in natu… Read More
    When does spring begin? The answer depends on who you ask. A meteorologist would answer 1 March. An astronomer would answer 20 March. But in nature there is no fixed date – spring simply begins when trees come into leaf, plants flower and birds and insects appear. This data visualisation reveals the date when each natural sign of spring first appeared in the UK, based on observations by hundreds of volunteers for the Woodland Trust’s Nature's Calendar Survey. Read Less
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This infographic, commissioned by BBC Focus Magazine, illustrates when spring begins and the possible answers the data may show. 
Springtime is shifting – its onset is arriving earlier than it used to, and there are a number of factors that illustrate this change. Using the visual metaphor of a sundial, reminiscent also of a sunrise or a blossoming flower, the infographic overlays multiple datasets to show a pattern in the shift.

The highlighted evidence of these changes includes consistent increases in UK monthly daytime temperatures, earlier emergence of springtime events tracked Woodland Trust’s Nature’s Calendar Survey,  including the February (no longer March) singing of Song Thrushes, the flowering of Snowdrops in January, and changes in leafing & flowering schedules of Hawthorns and horse chestnuts.
BBC Focus Magazine, March 2016
www.sciencefocus.com
Data research by Miriam Quick