"Spell" is not British jargon. It means a period of time having a particular kind of activity or condition. A "sunny spell" means a (short) period of time having sunny weather.
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"Spell" is not British jargon. It means a period of time having a particular kind of activity or condition.
A "sunny spell" means a (short) period of time having sunny weather. If it's sunny "spells" then you may have alternating periods of cloudy and sunny weather; you have spells (periods) of sunny weather.