Was the forecast right for Detroit on Sat Sep 5?
Detroit, Michigan · daily high temperature in °C · forecasts from each model's archived runs, verified against the DTW observations
11 days out, 4 models put Detroit's Sat Sep 5 high anywhere from 25° to 29°; by the final call the field had settled to a median of 26°. The day verified at 26° against the DTW observations, with 1.8 mm of precipitation — thunderstorms.
GFS landed closest, off by 0.1°. GEM ran 2° hot.
What every model said, at every lead
Daily-high calls for Sat Sep 5 as each model's runs approached it — the last archived run per day. NBM and The Spread's own blend are consensus products and stay out of these ranges and rankings; the Detroit scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 11d · 2026-08-25 | 29° | 27° | 26° | — | 25° | — | — | 25–29° |
| 10d · 2026-08-26 | 32° | 29° | 31° | — | 22° | — | — | 22–32° |
| 9d · 2026-08-27 | 29° | 29° | 26° | — | 26° | — | — | 26–29° |
| 8d · 2026-08-28 | 26° | 26° | 28° | 28° | 31° | — | — | 26–31° |
| 7d · 2026-08-29 | 25° | 26° | 27° | 31° | 32° | — | — | 25–32° |
| 6d · 2026-08-30 | 25° | 25° | 27° | 29° | 26° | 28° | — | 25–29° |
| 5d · 2026-08-31 | 25° | 25° | 25° | 27° | 28° | 26° | 26° | 25–28° |
| 4d · 2026-09-01 | 26° | 26° | 25° | 25° | 27° | 25° | 27° | 25–27° |
| 3d · 2026-09-02 | 26° | 26° | 25° | 23° | 27° | 26° | 27° | 23–27° |
| 2d · 2026-09-03 | 25° | 26° | 26° | 24° | 26° | 27° | 27° | 24–27° |
| 1d · 2026-09-04 | 25° | 26° | 26° | 25° | 25° | 24° | 26° | 24–26° |
| 0d · 2026-09-05 | 25° | 26° | 25° | 28° | 26° | 25° | 27° | 25–28° |
| actual | 26° |
Read it honestly
This is one date, not a league table. A model can win a day it deserved to lose; rankings only mean something over a window. For that, see which model has been most accurate in Detroit — or every city The Spread scores.
Forecasts are what each model's archived runs said at the time, captured at The Spread's sweep times — never reconstructed after the fact. Truth is the DTW observations. Archive depth varies by city; receipts exist only for dates the archive watched arrive.