The far future is the averages (light blue background) - the forecast is only in the "Forecast"-zone (light purple), but perhaps that can be made more clear (e.

The far future is the averages (light blue background) - the forecast is only in the "Forecast"-zone (light purple), but perhaps that can be made more clear (e.g. changing 2012 to "Averages" in the x-axis or something similar). Accuracy of predictions: the forecasts are as accurate as forecasts are, and we don't influence that. The averages (mean, 10th percentile, 90th percentile, etc) aren't accurate in any predictive sense - they're just the stats for the recorded history for the station. They tell you what you can reasonably expect, but YMMV. For SF in late April you can see that the average temperature is steadily rising and the chance of precipitation steadily declining: 62F high on average in early April, 65F towards the end. 8% precipitation vs 5% means almost half as much rain towards the end - I'd hold off until the last week of April if it's an option ;)