After the success of last year's market, we're doing it again! This market is for Spring 2026.

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 17 market as an example: If there are any readings after April 17 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.

Same behavior for any other dates listed.

Worked example from 2025: 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.

In other words, a market can resolve as Yes as early as the day after the date of the market, but the earliest a market will resolve as No is June 1.

More dates can be added, but each market is independent so new dates won't effect the odds or results of others.

Last year the final spring <40F was on April 16, but we got to 40F on April 27 and May 9