Partially melted snow (or a mixture of rain and snow).

Roget 383: cold, coldness etc. adj.; frigidity, inclemency, fresco.    winter; depth of winter, hard winter; Siberia, Nova Zembla; wind-chill factor.    [forms of frozen water] ice; snow, snowflake, snow crystal, snow drift; sleet; hail, hailstone; rime, frost; hoar frost, white frost, hard frost, sharp frost; barf; glaze [U.S.], lolly [U.S.]; icicle, thick-ribbed ice; fall of snow, heavy fall; iceberg, icefloe; floe berg; glacier; nev_ee, serac^†; pruina^†.    [cold substances] freezing mixture, dry ice, liquid nitrogen, liquid helium.    [Sensation of cold] chilliness etc. adj.; chill; shivering etc. v.; goose skin, horripilation^†; rigor; chattering of teeth; numbness, frostbite.    ... show more

Dutch: smeltende sneeuw, ijzel, ijsregen

Precipitate as a mixture of rain and snow.