Crystal the Snow Fairy by Daisy Meadows

The Weather Fairies have lost their magical feathers! Rachel and Kirsty search for one in each Weather Fairies book. Read all seven books to help bring the weather back to Fairyland!

Fairyland is home to the seven Weather Fairies! They use magical feathers to bring all of the weather to Fairyland. But when the feathers disappear, the weather turns wacky. The Weather Fairies must fix it -- fast!

In this book, Crystal the Snow Fairy has lost her magic feather. Now it's snowing in summer!
 
- Goodreads Summary