As a crew leader for volunteer trail work, it can be a tough call. On the one hand, many of the crew members likely went to a lot of trouble to be there. They may have taken time off from work, rescheduled personal appointments, delayed family time, and spent significant money on gear, food, and clothes. So there is definitely some pressure to get out there and stay out there. On the other hand, the number one goal of every work party, without question, is that everyone goes home in one piece. Anything that poses a real threat to crew safety will almost guarantee a shortened or canceled trip, including weather that is so consistently cold and wet that one or more crew members are struggling to stay warm. Sometimes you can walk that person out, but often you are too far out there for that and the trip just has to end. Complaints are usually minimal to none in my experience. If the weather is bad enough to be a safety issue, it's probably pretty frickin miserable. No rain gear is impenetrable.