Was the forecast right for Denver on Thu Sep 3?
Denver, Colorado · daily high temperature in °F · forecasts from each model's archived runs, verified against the DEN observations
9 days out, 4 models put Denver's Thu Sep 3 high anywhere from 79° to 91°; by the final call the field had settled to a median of 90°. The day verified at 92° against the DEN observations — partly cloudy.
ECMWF landed closest, off by 0.0°. ICON ran 4° cold.
What every model said, at every lead
Daily-high calls for Thu Sep 3 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 |
|---|---|---|---|---|---|---|---|---|
| 9d · 2026-08-25 | 79° | 80° | 80° | — | 91° | — | — | 79–91° |
| 8d · 2026-08-26 | 70° | 77° | 88° | 84° | 82° | — | — | 70–88° |
| 7d · 2026-08-27 | 78° | 85° | 86° | 90° | 79° | — | — | 78–90° |
| 6d · 2026-08-28 | 89° | 90° | 90° | 82° | 87° | 78° | — | 78–90° |
| 5d · 2026-08-29 | 89° | 88° | 89° | 86° | 91° | 83° | 89° | 83–91° |
| 4d · 2026-08-30 | 90° | 86° | 88° | 86° | 88° | 88° | 89° | 86–90° |
| 3d · 2026-08-31 | 89° | 87° | 93° | 85° | 91° | 85° | 88° | 85–93° |
| 2d · 2026-09-01 | 90° | 88° | 91° | 89° | 90° | 88° | 89° | 88–91° |
| 1d · 2026-09-02 | 90° | 89° | 89° | 88° | 90° | 90° | 88° | 88–90° |
| 0d · 2026-09-03 | 92° | 89° | 92° | 89° | 90° | 88° | 90° | 88–92° |
| actual | 92° |
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.