how accurate is the groundhog

February 17, 2026

Groundhog Day predictions are not very accurate in a scientific sense. Most analyses show the groundhog is right only about as often as a coin flip, and some famous groundhogs are wrong more than they’re right.

So… how accurate is “the” groundhog?

When people say “the groundhog,” they usually mean Punxsutawney Phil in Pennsylvania.

Long‑term analyses put Phil’s overall accuracy around 35–40% when you compare his call (early spring vs six more weeks of winter) with what actually happened in the following weeks.

One widely cited dataset (StormFax) says Phil’s predictions have been correct about 39% of the time overall, and only 4 out of the last 10 years.

A broader climatology study that looked at hundreds of predictions by many different groundhogs concluded their forecasts are essentially pure chance , with about 50% accuracy overall.

In other words, if you flipped a coin on February 2, you’d do at least as well—and often better—than the groundhog.

Do any groundhogs do better?

Some local “celebrity” groundhogs have better records, but they still aren’t on par with real meteorology.

A Canadian review found success rates ranging roughly from the mid‑20% range up to about 65% for the better‑performing animals.

One example: Staten Island Chuck in New York has been reported at around 80–85% accuracy in some local media tallies, though that depends heavily on how “success” is defined and which years you count.

Many others cluster around 25–50%, which again is no better than random.

So you’ll see headlines every year about “this one groundhog is way more accurate than Phil,” but even the better numbers are usually based on small samples and loose definitions.

Why is the accuracy so low?

There are a few built‑in reasons this tradition doesn’t translate into real forecasting power:

The prediction is extremely vague : just “early spring” vs “six more weeks of winter,” with no clear rule for what counts as which. That makes checking accuracy subjective.
Local weather is complicated; one animal in one town can’t meaningfully predict regional or national patterns weeks in advance.
Records of what each groundhog “said” in the past are sometimes incomplete or inconsistent, which makes stats messy.

Real seasonal forecasts use ocean temperatures, atmospheric patterns, and big climate datasets; Groundhog Day uses a shadow and a ceremony.

A climatology team even used the blooming date of a wildflower as a natural marker of spring and still found the groundhog signals matched spring’s arrival only at random‑chance levels.

So what is Groundhog Day really good for?

While it’s bad meteorology, it’s great tradition :

It’s an annual mid‑winter ritual that gives people something fun and slightly silly to rally around.
Towns build festivals, tourism, and local identity around their groundhog.
Media and online forums treat it as a light, recurring meme more than actual science.

If you want real guidance on when spring is coming, you’re better off checking professional seasonal outlooks and local forecasts. If you just want a bit of folklore and spectacle, the groundhog is perfect for that—even if he’s “wrong” most of the time. TL;DR: The groundhog’s weather prediction skill is basically no better than random, and often worse, but the tradition survives because it’s fun, not because it’s accurate.