Was the forecast right for Detroit on Sun Sep 13?
Detroit, Michigan · daily high temperature in °F · forecasts from each model's archived runs, verified against the DTW observations
13 days out, 4 models put Detroit's Sun Sep 13 high anywhere from 60° to 90°; by the final call the field had settled to a median of 81°. The day verified at 81° against the DTW observations — cloudy.
ICON landed closest, off by 0.0°. GEM ran 3° hot.
What every model said, at every lead
Daily-high calls for Sun Sep 13 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 |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-08-29 | — | 93° | — | — | 79° | — | — | 79–93° |
| 14d · 2026-08-30 | 79° | 74° | — | — | 75° | — | — | 74–79° |
| 13d · 2026-08-31 | 77° | 67° | 60° | — | 90° | — | — | 60–90° |
| 12d · 2026-09-01 | 75° | 76° | 82° | — | 77° | — | — | 75–82° |
| 11d · 2026-09-02 | 82° | 85° | 83° | — | 93° | — | — | 82–93° |
| 10d · 2026-09-03 | 75° | 92° | 72° | — | 83° | — | — | 72–92° |
| 9d · 2026-09-04 | 74° | 78° | 81° | — | 80° | — | — | 74–81° |
| 8d · 2026-09-05 | 72° | 85° | 74° | 67° | 95° | — | — | 67–95° |
| 7d · 2026-09-06 | 73° | 82° | 85° | 75° | 89° | — | — | 73–89° |
| 6d · 2026-09-07 | 80° | 80° | 82° | 81° | 89° | 68° | — | 68–89° |
| 5d · 2026-09-08 | 77° | 74° | 82° | 73° | 88° | 74° | 84° | 73–88° |
| 4d · 2026-09-09 | 76° | 80° | 82° | 79° | 88° | 84° | 82° | 76–88° |
| 3d · 2026-09-10 | 77° | 81° | 81° | 75° | 83° | 79° | 80° | 75–83° |
| 2d · 2026-09-11 | 78° | 80° | 81° | 80° | 82° | 82° | 81° | 78–82° |
| 1d · 2026-09-12 | 78° | 80° | 82° | 85° | 82° | 81° | 81° | 78–85° |
| 0d · 2026-09-13 | 79° | 81° | 80° | 84° | 82° | 81° | 80° | 79–84° |
| actual | 81° |
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.