translate English to French: Column 13— Measured afternoon snowfall: (a) (b) On day 1, if there has been any snowfall since the morning observation, record the snowfall amount measured in the afternoon in column 13 to at least the nearest 0.2 cm, or enter "27" for "trace".
Procéder de la même façon, pendant le reste du mois, pour inscrire les quantités de neige tombées l’après-midi.