Early Quenya
kalle
noun. fair weather, clear sky, blue sky
kal-
verb. to shine
kala-
verb. to shine
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
ᴱQ. kalle “fair weather, clear sky, blue sky” appeared in the Qenya Lexicon as a derivative of the root ᴱ√KALA “shine golden” (QL/44). It also appeared in the Poetic and Mythological Words of Eldarissa with gloss “fair weather” (PME/44).
Neo-Quenya: I think this word might be salvaged as ᴺQ. callë, since the later root √KAL was still associated with light, and this description of fair weather seems to boil down to “lightness”, as in the absence of obscuring clouds.