I can honestly say that i havent lost too many days due to weather, last january was bad, but, when you lose a day, try and make up in the next week.
Today i got half my work done, due to not having a spare tap for my microbore, so will cover todays work Monday, yes will be a long day, but will keep me on target.
I also learnt to try and do all my work in 4 days, then i do have a spare day a week to catch up.
Make hay when the sun shines, ie.....connie cleaning etc, and put some by for the winter.