For about eight to twelve hours continuously in a winter storm, and intermittently until the wind swings west.
For a very short while from a thunder cloud rising on a west wind.
For an hour or more from a thundercloud that rises on a southwest or southeast wind.
The temperature will fall when:
A thunderstorm breaks, continuing low if the wind blows from the west after clearing.
Nightfall approaches and the sky is free from clouds.
The mercury remains at the same level during the sunny hours.
A cyclone is departing and the anticyclone moving in.
The wind swings north of east in a storm,—the fall will be gradual.