These data were collected at Shannon Point Marine Center in Washington, U.S.A. in March and May, 2021. Embryos were reared at either 10 (ambient), 12, 14, or 16C in March and at either 10 or 16C in spring. Both March and May experiments used two target pCO2 treatments of either ~500 uatm (ambient) or ~2000 uatm (heightened). These data assessed the experimental treatment conditions throughout the March and May experiments.