The initial cool wave of September is likely over as we welcome warmer temperatures for the next several weeks. The Climate Prediction Center is showing strong confidence for above-normal temperatures through September 24rd, which should help accumulate growing degree days and move agricultural production further along.
Outlooks are showing significant probabilities for above-normal precipitation over the next few weeks, but it is uncertain how much and when that precipitation will occur. The 3-month (September-November) climate outlook is indicating significant probabilities for above-normal temperatures.
This will hopefully discourage any cold waves passing through from causing an earlier-than-desired hard freeze event. However, keep in mind that predictions are still too far in the future to provide any certainty and climate outlooks are unable to account for a brief (1-to-3-day) event from passing through with temperatures low enough to cause a frost. Primary message: still too soon to predict when the first fall frost will occur.
Beth Hall, PhD
Director, Indiana State Climate Office