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All answers having "Weather forecast" as clue:

3 Character Answers:

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HOT



4 Character Answers:

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COLD

FAIR

HAIL

RAIN

SNOW



5 Character Answers:

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CLEAR

GALES

RAINY

SLEET

SUNNY

WINDY



6 Character Answers:

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CLOUDY

COLDER

MILDER

SLEETY

WARMER



7 Character Answers:

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SHOWERS



9 Character Answers:

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COLDSPELL

WARMTREND



11 Character Answers:

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FAIRANDWARM



15 Character Answers:

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CLOUDYANDCOOLER

ELECTRICALSTORM

HAZYHOTANDHUMID

LOWTEMPERATURES

PARTIALCLEARING