Was the forecast right for Denver on Wed Sep 2?
Denver, Colorado · daily high temperature in °F · forecasts from each model's archived runs, verified against the DEN observations
8 days out, 5 models put Denver's Wed Sep 2 high anywhere from 84° to 90°; by the final call the field had settled to a median of 86°. The day verified at 88° against the DEN observations — drizzle.
AIFS landed closest, off by 0.3°. UKMO ran 3° cold.
What every model said, at every lead
Daily-high calls for Wed Sep 2 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 Denver scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 8d · 2026-08-25 | 84° | 84° | 86° | 85° | 90° | — | — | 84–90° |
| 7d · 2026-08-26 | 84° | 85° | 86° | 85° | 84° | — | — | 84–86° |
| 6d · 2026-08-27 | 89° | 87° | 84° | 87° | 88° | 89° | — | 84–89° |
| 5d · 2026-08-28 | 88° | 86° | 84° | 87° | 87° | 90° | 86° | 84–90° |
| 4d · 2026-08-29 | 87° | 86° | 87° | 86° | 88° | 86° | 86° | 86–88° |
| 3d · 2026-08-30 | 88° | 84° | 86° | 86° | 87° | 84° | 87° | 84–88° |
| 2d · 2026-08-31 | 89° | 85° | 90° | 86° | 86° | 84° | 84° | 84–90° |
| 1d · 2026-09-01 | 88° | 86° | 88° | 88° | 86° | 84° | 86° | 84–88° |
| 0d · 2026-09-02 | 88° | 86° | 87° | 88° | 86° | 85° | 85° | 85–88° |
| actual | 88° |
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 Denver — 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 DEN observations. Archive depth varies by city; receipts exist only for dates the archive watched arrive.