Was the forecast right for Denver on Sun Aug 9?
Denver, Colorado · daily high temperature in °F · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
14 days out, 4 models put Denver's Sun Aug 9 high anywhere from 82° to 98°;by the final call, the day before, the field had settled to a median of 96°. The day verified at 97° against the ECMWF IFS analysis, with 0.03 in of precipitation — drizzle.
ICON landed closest, off by 0.1°. GEM ran 4° cool.
What every model said, at every lead
Daily-high calls for Sun Aug 9 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 |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-07-25 | — | 85° | — | — | 95° | — | — | 85–95° |
| 14d · 2026-07-26 | 82° | 93° | 87° | — | 98° | — | — | 82–98° |
| 13d · 2026-07-27 | 86° | 90° | 98° | — | 100° | — | — | 86–100° |
| 12d · 2026-07-28 | 96° | 93° | 92° | — | 101° | — | — | 92–101° |
| 11d · 2026-07-29 | 95° | 85° | 96° | — | 98° | — | — | 85–98° |
| 10d · 2026-07-30 | 89° | 78° | 99° | — | 81° | — | — | 78–99° |
| 9d · 2026-07-31 | 91° | 93° | 99° | 94° | 99° | — | — | 91–99° |
| 8d · 2026-08-01 | 97° | 84° | 104° | 96° | 99° | — | — | 84–104° |
| 7d · 2026-08-02 | 98° | 96° | 104° | 94° | 98° | — | — | 94–104° |
| 6d · 2026-08-03 | 94° | 96° | 102° | 96° | 100° | 97° | 99° | 94–102° |
| 5d · 2026-08-04 | 95° | 92° | 101° | 95° | 99° | 98° | 97° | 92–101° |
| 4d · 2026-08-05 | 96° | 96° | 99° | 95° | 101° | 97° | 99° | 95–101° |
| 3d · 2026-08-06 | 95° | 96° | 97° | 93° | 100° | 98° | 97° | 93–100° |
| 2d · 2026-08-07 | 95° | 95° | 98° | 93° | 98° | 98° | 98° | 93–98° |
| 1d · 2026-08-08 | 95° | 96° | 97° | 93° | 98° | 97° | 96° | 93–98° |
| actual | 97° |
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 ECMWF IFS analysis (temperature_2m_max). 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.