It's time to start guessing what the corn yield will be for 2015 so you can factor that into your marketing plan.
Illinois says yields can be all over the place. There is no solid way to estimate. Their number crunching is that the long term yield trend line is as accurate as any (admitting that when all lis said and done it won't be all that accurate, either).
So....you can just ignore it all and market by the seat of your pants, which is what most will do.
If you do want to look at the first of what will be a mountain of guesses over the year, here is one. It's a long, complicated, busy article.
http://farmdocdaily.illinois.edu/2015/02/expectations-for-2015-us-average-corn-yield.html
"Implications
The U.S. average corn yield since 1960 has shown: i) large positive and negative deviations from trend, ii) the duration of consecutive years with above or below trend yields has varied considerably, iii) the correlation between yield deviations in consecutive years is negligible, and iv) the pattern of yield deviations following years of very large positive deviations (like 2014) is quite mixed. This diverse and largely random set of patterns suggests that the most objective early-season yield expectation for any year, including 2015, should be based on the trend of actual yields. A range of trend yield projections is plausible depending on the sample period, the functional form of the trend model, and whether a bias adjustment is considered or not. Given the various alternatives, we maintain that yield expectations should be based on the longest sample of data with a stable trend yield component. Since we have been unable to find significant evidence of trend yield shifts since 1960, we argue that the period of 1960-2014 best meets this criterion. After adjusting for bias, the best linear fit of actual yields in the U.S. from 1960 through 2014 results in a trend yield projection for 2015 of 164 bushels per acre. This is 2.8 bushels less than the USDA's 2015 trend yield projection for corn of 166.8 bushels released at last week's Outlook Forum. The higher trend projection by the USDA is likely due to a sample that starts in the drought year of 1988 and a "certainty-equivalent" approach that assumes with certainty average weather and planting progress will occur in 2015. Regardless of which trend projection is considered, there is, as usual, large risk of deviations from the projection. For example, we estimate there is roughly a one-in-ten chance of the U.S. average corn yield falling below 150 bushels and a two-in-ten chance of yield rising above 170 bushels. It's no wonder that weather forecasters are in such high demand."
