春天来了！
Chūn tiān lái le!
Spring has come!
Simple and joyful
春天到了，到处都是花，天气真好。
Chūn tiān dào le, dào chù dōu shì huā, tiān qì zhēn hǎo
Spring arrived, flowers everywhere, weather really good.
到处 = everywhere
春暖花开，万物复苏，这才是春天该有的样子！
Chūn nuǎn huā kāi, wàn wù fù sū, zhè cái shì chūn tiān gāi yǒu de yàng zi!
Spring warm flowers bloom, all things revive, this is what spring should look like!
春暖花开 = classic 4-char idiom (spring warmth flowers bloom); 万物复苏 = all things revive, poetic
More Chinese (Mandarin) Weather Phrases