How do you measure the start of spring?
Astronomy-based definition/vernal equinox (March 20 this year)
Meteorology-based definition (March 1 every year)
Precipitation: The median date of the last measurable snowfall
Temperature: The average date of the last freeze
Temperature: End of the quarter of the year with the lowest daily average temperatures
Planting: Ground temperature of 40 degrees
First leaves on trees
Return of migratory birds
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