I will admit, I am not great at this. However, I realize the importance of seasonal changes that have been occurring. For example, according to the USDA zone system, we are zone 9, and our last frost date is the 6th of this month. Great, we had frost this morning though on the 7th, and it is predicted for tomorrow the 8th.
Weather or not you believe in global warming is not relevant. What is important is that we as gardeners keep track of our successes, and changes in the weather, and most importantly our failures. How else will you and others learn?