My reactions to the new icons are mixed. I liked the animated clouds a lot, but the sun definitely needs more contrast to prevent it from looking like a certain snack.
I could distinguish between rain and snow alright in HD, but I think they could have made the snowflakes a little bigger to make it easier to discern the two precipitation types. The lightning should stand out a little more in the thunderstorm icons like it did in the previous set. Overall, there are some improvements in clarity here compared to the last icon set, but I think they could have used a little more contrast to make them even better.