Precipitation markets hinge on definitions most traders never check: a 'trace' is recorded when there is measurable activity below 0.01 inches, and whether a trace counts as rain differs by market. Similarly, snow depth and liquid-equivalent are different measurements that resolve differently. You read each rulebook, identify markets whose price implies the wrong definition, and take the side that the written rule supports rather than the side the weather suggests.
Markets on Polymarket where trace-precipitation resolution-rule edge is the natural play:
