Don't know if there actually is a mural season! If so, it's still not the end of the rains. We still have at least 1-2 full rainy months ahead of us, though admittedly, this year's rains have been kinda dry. In fact, we've had dry seasons with more rain before. As for the murals, I've been seeing them appear at various times in different places. The one on the stairs (Mexican vertigraph) was painted right at the beginning of the rainy season. Still I don't want to exclude the possibility. Let me ask around... After being gone almost all year in 2018 I was hoping to see many new pictures when I came back. It wasn't the case, making me a bit disappointed. Now all of a sudden, there are a number of things appearing again.
Do you have cool murals in Thai streets? (I'm sure, you must have!)