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The fast evaporative cooling of micrometer-sized water droplets in vacuumoffers the appealing possibility to investigate supercooled water - below themelting point but still a liquid - at temperatures far beyond thestate-of-the-art. However, it is challenging to obtain a reliable value of thedroplet temperature under such extreme experimental conditions. Here, theobservation of morphology-dependent resonances in the Raman scattering from astream of perfectly uniform water droplets has allowed us to measure with anabsolute precision of better than 0.2% the variation in droplet size resultingfrom evaporative mass losses. This finding proved crucial to an unambiguousdetermination of the droplet temperature. In particular, a fraction of waterdroplets with initial diameter of 6379$\pm$12 nm were found to remain liquiddown to 230.6$\pm$0.6 K. Our results question temperature estimates reportedrecently for larger supercooled water droplets, and provide valuableinformation on the hydrogen-bond network in liquid water in the hard-to-accessdeeply supercooled regime.

Shrinking of Rapidly Evaporating Water Microdroplets Reveals their Extreme Supercooling