Was the forecast right for Denver on Tue Sep 8?
Denver, Colorado · daily high temperature in °F · forecasts from each model's archived runs, verified against the DEN observations
13 days out, 4 models put Denver's Tue Sep 8 high anywhere from 70° to 89°; by the final call the field had settled to a median of 83°. The day verified at 86° against the DEN observations — drizzle.
UKMO landed closest, off by 1.3°. AIGFS ran 5° cold.
What every model said, at every lead
Daily-high calls for Tue Sep 8 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 |
|---|---|---|---|---|---|---|---|---|
| 14d · 2026-08-25 | 72° | 83° | — | — | 83° | — | — | 72–83° |
| 13d · 2026-08-26 | 70° | 83° | 89° | — | 79° | — | — | 70–89° |
| 12d · 2026-08-27 | 82° | 88° | 78° | — | 79° | — | — | 78–88° |
| 11d · 2026-08-28 | 86° | 77° | 87° | — | 83° | — | — | 77–87° |
| 10d · 2026-08-29 | 92° | 91° | 86° | — | 85° | — | — | 85–92° |
| 9d · 2026-08-30 | 84° | 91° | 93° | — | 95° | — | — | 84–95° |
| 8d · 2026-08-31 | 80° | 84° | 75° | 85° | 93° | — | — | 75–93° |
| 7d · 2026-09-01 | 86° | 82° | 87° | 89° | 90° | — | — | 82–90° |
| 6d · 2026-09-02 | 89° | 83° | 79° | 86° | 80° | 85° | — | 79–89° |
| 5d · 2026-09-03 | 91° | 84° | 87° | 87° | 80° | 81° | 72° | 72–91° |
| 4d · 2026-09-04 | 88° | 82° | 87° | 86° | 88° | 85° | 76° | 76–88° |
| 3d · 2026-09-05 | 87° | 83° | 88° | 85° | 85° | 85° | 87° | 83–88° |
| 2d · 2026-09-06 | 86° | 84° | 87° | 84° | 86° | 87° | 85° | 84–87° |
| 1d · 2026-09-07 | 84° | 82° | 84° | 84° | 85° | 84° | 87° | 82–87° |
| 0d · 2026-09-08 | 84° | 81° | 84° | 83° | 83° | 83° | 85° | 81–85° |
| actual | 86° |
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.