College football weather data
How Rain Affects College Football Games: What 7,000+ Games Show
By OverUnderWeather Research Desk
Rain gets blamed for every slow college football game, but most wet Saturdays play out almost normally. Across 7,072 outdoor FBS games since 2016, drizzle and light showers changed scoring by half a point. Heavy rain — 2.5 mm or more during the game — is different: those games scored about 5 points less than dry games. Here is how much rain it takes, what changes on the field, and what to check before kickoff.
The short answer
Drizzle
Basically nothing: -0.5 points vs dry games.
Steady rain
Slightly lower scoring, but not a reliable difference.
Heavy rain
About 5.1 fewer points across 71 games — a real effect.
How much rain changes a college football game
Each game is matched to rainfall measured at the stadium's own coordinates during the game window, then compared with dry games from the same season — scoring has drifted down from about 57 to 52 points a game since 2016, so a plain average would mislead.
| Rain during the game | Games | Avg total points | vs dry games |
|---|---|---|---|
| Dry (no measurable rain) | 6,112 | 55.4 | baseline |
| Drizzle (under 0.25 mm) | 481 | 55.0 | -0.5within noise |
| Steady rain (0.25–2.5 mm) | 408 | 54.2 | -1.5within noise |
| Heavy rain (2.5 mm+) | 71 | 50.4 | -5.1real difference |
"vs dry games" is season-adjusted. Only the heavy-rain band clears our significance test, and at 71 games it is still a modest sample.
Why light rain barely matters
A passing shower doesn't change how coaches call a game. Modern balls, gloves and turf handle light moisture well, and most of the game is often played dry even when rain is recorded. It takes a sustained, soaking rain before offenses lean on the run, passing accuracy drops and drives stall — and that is exactly where the scoring drop shows up.
What heavy rain does to the betting total
The market handles drizzle fine. In heavy rain, games finished about 3.9 points below the closing total compared with dry games (t = -2.35). One likely reason is that a reliable heavy-rain forecast often firms up close to kickoff — we have not verified that timing ourselves. Treat this as historical context, not a pick. The full method, season-by-season table and corrections are in our college football rain and totals study. For the pro game, see how rain affects NFL games.
What to check before a wet Saturday
- How much, not whether. A rain icon means little. Look for steady rain of 2.5 mm or more across the game window.
- Timing. Rain that clears by kickoff or arrives in the fourth quarter does far less than rain all game.
- Wind on top of rain. Wind hits kicking and deep passes directly — see the windiest college football stadiums.
- Lightning. Storms stop games, rain doesn't — see college football weather delays.
Every FBS venue's live game-day forecast is on the college football weather desk.
How we measured it
7,072 regular-season outdoor FBS games, 2016–2025, that carry both a closing total and game-window rainfall (6,112 dry, 960 wet). Domes are excluded. Differences are season-adjusted against dry games; we only call a difference real when its t statistic passes ±1.96 and the band has at least 40 games. Numbers are not adjusted for team strength.
Where this is applied
These findings feed the game-time read on every College Football venue page, using the same sample-size and significance rules published here.
OverUnderWeather Research Desk
Independent data analysis on public sports and weather records. Studies match historical game outcomes to archived game-window weather, apply pre-set sample and significance rules, and publish null results when that is what the data show. Editorial policy and corrections log.
Cite this research
Free to republish with a visible credit and a link to this page. Ready-made citations below — click to copy.
Frequently asked
Does rain lower scoring in college football?
Only when it really rains. Drizzle and light showers made no measurable difference across our 7,072-game sample. Games with 2.5 mm or more of rain during the game window scored about 5.1 fewer points than dry games from the same seasons (71 games, t = -2.81).
How much rain is 'heavy' for a football game?
We use 2.5 mm or more across the game window — a steady, soaking rain rather than passing showers. Only about 1% of outdoor college games reach that level, which is why most 'rain games' play out close to normal.
Do college football games get delayed for rain?
Not for rain alone. College games stop for lightning within roughly 8 miles of the stadium, not for rainfall. Our college football weather delays guide covers the lightning rules and how long stoppages usually last.
Why does heavy rain cut scoring?
A wet ball is harder to grip and throw, footing gets worse on grass, and teams tend to run more and pass less — which keeps the clock moving and shortens the game. Light rain is not enough to change play calling, which fits what the data shows.
Do betting totals already account for rain?
Mostly. Heavy-rain games still finished about 3.9 points below the closing total compared with dry games (t = -2.35), but that is 71 games over ten seasons. Light rain is priced in. This is historical information, not a recommendation to bet.
Is rain or wind worse for college football?
Wind matters more often. Strong wind shows up in many more games and hits field goals and deep passes directly. Heavy rain has a bigger single-game effect but is rare. Check both on game day.