season creep
...that signs of spring trending to earlier arrivals are evidence of season creep?
...that signs of <a href="./Spring_(season)" id="mwAiY" rel="mw:WikiLink" title="Spring (season)">spring</a> trending to earlier arrivals are evidence of <b id="mwAic"><a href="./Season_creep" id="mwAig" rel="mw:WikiLink" title="Season creep">season creep</a></b>?