"ЛітодужетеплеуКиєві."

You have to spell the Ukrainian capital as 'Kyiv'. I made the same mistake.

If you speak about hot weather, there is a Ukrainian word "спекотливий" or "гарячий" to better translate "hot summer".

Спекотливе літо, спекотна пора, гарячий день (although гарячий is primarily used for hot physical objects, if I'm not mistaken, гаряча плита - hot stove)