Blue Sky
noun
This is simply a blue sky (aka a blue sky!).
You'd think that this word would use on'yomi readings to read it, but it doesn't (shake that angry fist at the kanji gods!). Instead, it's double kun'yomi, probably because this word is really like two separate words put together, "blue" and "sky." In the previous level you unlocked these two separate words, learning their readings. That means you should be able to read this as well.
One quick note is the rendaku-fication of 空 as well. It becomes ぞら.
今日は青空が広がっている。
The blue sky is spreading out today.
青空の下で花見をしました。
We did a cherry blossom viewing under the blue sky.
五月は青空の日が多いですね。
Many days in May have a blue sky.