In phenology (the study of cyclic and seasonal natural phenomena), season creep refers to observed changes in the timing of the seasons, such as earlier indications of spring in temperate areas across the Northern Hemisphere.
In Europe, season creep has been associated with the arrival of spring moving up by approximately one week in a recent 30-year period. Climate studies have put the rate of season creep measured by plant phenology in the range of 2–3 days per decade advancement in spring, and 0.3–1.6 days per decade delay in autumn, over the past 30–80 years.
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The Daily Omnivore 