A cold snap is a short sudden spell of very cold weather. A cold snap in April.
The damage is done by how fast it comes rather than by how cold it gets. A cold snap after warm weather kills the blossom and with it the year's fruit.
1nouncold snapA short sudden spell of very cold weather.
“The cold snap burst pipes all over the county.”
cold snap is a spell.
Practised in Weather & Seasons