If you're standing on the ground in a flat world the cloud are rendered dark and I don't think it is intentional.
[media]
Environment
Playing on Java: 1.8.0_51 64bit
CPU: 8x Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
GeForce GTX 1050/PCIe/SSE2
4.6.0 NVIDIA 445.87
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-186079.
Please use the search function in the future to prevent duplicate reports.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki