Very warm temperatures are forecast this Friday and into the weekend. Portions of Iowa will be pushing 90°F each day. The featured map presents the percentage of years that the given long term climate site recorded at least one daily high temperature of 90+ degrees between 12 and 30 September. Maps like these tend to be a bit noisy with varying periods of record and micro-climate effects, but the general pattern over the state is clear with the highest frequencies over southern Iowa and lowest over northeastern Iowa. Overall, percentages shown are below 50% for practically the entire state, so having such a warm temperature happens less often than not. Certainly, it would be the most exceptional to have such a warm temperature over northeastern Iowa, where shown frequencies are in the 10-20% range (one out of every 5 to 10 years).

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