Official source is wunderground.com . We’ll use the midway weather station because wunderground supports calendar view for that station https://www.wunderground.com/calendar/us/il/chicago/KMDW
For the April 15 market as an example: If there are any readings after April 15 where the temperature is below 40 degrees Fahrenheit then that market will resolve as No. If we make it to June 1 and it has stayed above 40 then it resolves as Yes.
Same behavior for any other dates listed.
Update 2025-04-02 (PST) (AI summary of creator comment): - Post-Day Readings: Only temperature readings recorded after the end of the specified day count. In other words, a low temperature on the day itself (e.g., April 1) does not affect the market.
Example for April 1 Market: The April 1 low below 40°F does not trigger resolution. Only a reading below 40°F after April 1 (such as on April 2 or later) will be considered.
Resolution Impact: The market will continue to have the possibility of a different outcome until a qualifying low (post-day reading under 40°F) is recorded before the market’s close date.
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I'm pretty sure I flipped the Yes and No when I said "If there are any readings after April 15 where the temperature is below 40 degrees Fahrenheit then that market will resolve as No. If we make it to June 1 and it has stayed above 40 then it resolves as Yes."
It should have been "If there are any readings after April 15 where the temperature is below 40 degrees Fahrenheit then that market will resolve as Yes. If we make it to June 1 and it has stayed above 40 then it resolves as No." But the overall setup of the market including the title and the resolutions are correct as is.
We’ll use the midway weather station because wunderground supports calendar view for that station
Rules clarification: the low on April 1 was below 40, but that doesn’t affect the April 1 market. There has to be a low after the end of the day of April 1 to count as after April 1. As of 6:55am April 2 that hasn’t happened yet (temp was about 44 at midnight) so it’s still possible for the April 1 market to resolve as no. But if it does drop below 40 any time before June then the April 1 market will resolve as yes.