How the score works.

Every game gets a rainout risk score from 0 to 100. The score isn't a weather forecast. It's a read on whether conditions are likely to actually stop play.

We look at precipitation probability and expected rainfall at first pitch, what the conditions are forecast to be, wind speed, and temperature. Then we factor in whether the rain is expected to last through the game or clear up partway through. Rain that's gone by the 3rd inning plays very differently than rain that's steady all afternoon.

What the score means

Score	Tier	What to expect
0 – 20	Low	Play expected. No meaningful weather risk at game time.
21 – 40	Moderate	Worth keeping an eye on. Some chance of rain but conditions are borderline.
41 – 69	High	A delay is likely. Rain expected at or near first pitch, though it may clear.
70 – 100	Severe	Postponement likely. Heavy rain forecast to persist through most of the game.

A note on covered stadiums

Retractable roof stadiums (Seattle, Miami, Milwaukee, Houston, Texas, and Arizona) get a significant score reduction since teams will close the roof when rain is likely. Fixed domes like Tampa Bay and Toronto always score zero regardless of conditions outside.

How often is it updated?

Scores update hourly. Forecasts tighten significantly in the 6 hours before first pitch, so the most useful time to check is the morning of the game and again about 2 hours out.