Was the forecast right for Detroit on Tue Sep 1?
Detroit, Michigan · daily high temperature in °C · forecasts from each model's archived runs, verified against the DTW observations
7 days out, 5 models put Detroit's Tue Sep 1 high anywhere from 28° to 35°;by the final call, the day before, the field had settled to a median of 33°. The day verified at 32° against the DTW observations — drizzle.
ECMWF landed closest, off by 0.3°. GEM ran 4° warm.
What every model said, at every lead
Daily-high calls for Tue Sep 1 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 |
|---|---|---|---|---|---|---|---|---|
| 7d · 2026-08-25 | 28° | 29° | 29° | 35° | 30° | — | — | 28–35° |
| 6d · 2026-08-26 | 32° | 34° | 27° | 34° | 30° | 34° | 32° | 27–34° |
| 5d · 2026-08-27 | 32° | 33° | 29° | 34° | 38° | 36° | 33° | 29–38° |
| 4d · 2026-08-28 | 29° | 32° | 29° | 29° | 36° | 32° | 35° | 29–36° |
| 3d · 2026-08-29 | 29° | 31° | 33° | 30° | 35° | 30° | 33° | 29–35° |
| 2d · 2026-08-30 | 31° | 31° | 31° | 34° | 35° | 32° | 32° | 31–35° |
| 1d · 2026-08-31 | 31° | 32° | 32° | 36° | 35° | 34° | 33° | 31–36° |
| actual | 32° |
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. The actual values are the ones in hand when this receipt was settled, usually 2 days after the date; a correction published after that is not carried into it. Archive depth varies by city; receipts exist only for dates the archive watched arrive.