Mine is clearly not double. The plant is probably very old. At least 15 years, if not much older. It was in an abandoned garden.
My second rescued NOID is opening. It will probably open tomorrow. It will be double. I'll post a picture tomorrow.
The first pink single is not affected by rain. It was raining really hard today, but the flowers have not changed. I love the warm pink of this one. It goes very well with other pinks, and reds. I am happy with this one.