The phrase "continual rain" is correct and usable in written English.
You can use it when referring to a prolonged period of rain, such as "The town has been experiencing a continual rain for two days now."
He registered the heat, the sound of continual rain.
He said the game was postponed because the forecast called for "steady and continual rain through the day on Monday".
For the Mets, the sliver of positive news that came through the continual rain in Saturday's game was Santana's performance.
The Venusian skies would have been cloudy with almost continual rain lashing down in some regions, however.
For the first five days, I fished in continual rain at Delphi Lodge in Connemarra, on Ireland's northwest coast, it seemed a moot point.
Under slate-grey skies and after continual rain had kept the players off the field until 3.20pm, the ball darted left and right, north and south.
His sentiments were shared by other weather-dependent businesses around the state, as Connecticut, like the rest of the Northeast, has been pummeled by continual rains, unseasonably cool temperatures and gray skies that have created a feeling of dusk throughout the day.
It occurred on 15/17 observation days, with the only two days on which it did not occur (January 11 and 24) being, respectively, the only windless day, and the only day with continual heavy rain.
We have had terrific weather this last fortnight just a continual shower of rain from morning to night.
Continual storms and heavy rain have hampered emergency responders from being able to fully assess the damage, and the National Weather Service issued a flash flood emergency for downtown Oklahoma City.
Conversely, field dumps are exposed to continual environmental inputs from rain, soil, falling debris, and animal and plant incursions [15].
