The day was gray, and threatening, but did not rain for the whole time I was there. For many of us, we baby our English motor classics, so we don't like to take them out in the rain. It would require hand drying all the parts afterwards. I may not have gone if it were raining a drizzle.
I live about 20 minutes away so it was easy for me to have the top down. All the other cars had their roofs up, except for mine, and one MGB. I took the topless Morgan out for a long drive last weekend, and it was about 50 degrees F. When the sun went down, I put the top up for my passenger who was getting a bit cold.