In some years it is the commonest calanoid in the winter and spring in the mid-Atlantic region, and sometimes also in summer and autumn in Long Island Sound.

[2] Temora longicornis participates in diel vertical migrations, spending the day in the oxygen-minimum zone and swimming to the ocean surface at sunset.

[6] This species' eggs float near the surface before they hatch and the developing larvae move deeper into the water column at each successive moult.

The species has been shown to sometimes produce diapausing eggs in the summer months of June and July in Long Island Sound.

The eggs are buried in the sediment for a species-specific length of time and then hatch, moving into the water column as nauplius larvae as they develop.