Was the forecast right for Denver on Wed Aug 19?
Denver, Colorado · daily high temperature in °C · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
13 days out, 4 models put Denver's Wed Aug 19 high anywhere from 25° to 32°; by the final call the field had settled to a median of 32°. The day verified at 33° against the ECMWF IFS analysis, with 0.8 mm of precipitation — drizzle.
UKMO landed closest, off by 0.0°. GEM ran 2° cold.
What every model said, at every lead
Daily-high calls for Wed Aug 19 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 · 2026-08-04 | — | 20° | — | — | 39° | — | — | 20–39° |
| 14d · 2026-08-05 | 26° | 28° | — | — | 32° | — | — | 26–32° |
| 13d · 2026-08-06 | 25° | 29° | 26° | — | 32° | — | — | 25–32° |
| 12d · 2026-08-07 | 28° | 33° | 27° | — | 36° | — | — | 27–36° |
| 11d · 2026-08-08 | 26° | 34° | 29° | — | 25° | — | — | 25–34° |
| 10d · 2026-08-09 | 28° | 26° | 30° | — | 36° | — | — | 26–36° |
| 9d · 2026-08-10 | 28° | 32° | 33° | — | 34° | — | — | 28–34° |
| 8d · 2026-08-11 | 27° | 31° | 33° | 33° | 35° | — | — | 27–35° |
| 7d · 2026-08-12 | 30° | 32° | 31° | 34° | 37° | — | — | 30–37° |
| 6d · 2026-08-13 | 27° | 27° | 32° | 32° | 33° | 31° | — | 27–33° |
| 5d · 2026-08-14 | 28° | 24° | 28° | 27° | 25° | 24° | 31° | 24–31° |
| 4d · 2026-08-15 | 27° | 23° | 27° | 29° | 29° | 31° | 32° | 23–32° |
| 3d · 2026-08-16 | 30° | 27° | 29° | 31° | 34° | 31° | 31° | 27–34° |
| 2d · 2026-08-17 | 31° | 30° | 31° | 30° | 34° | 32° | 32° | 30–34° |
| 1d · 2026-08-18 | 31° | 31° | 31° | 31° | 36° | 32° | 33° | 31–36° |
| 0d · 2026-08-19 | 31° | 31° | 32° | 31° | 33° | 32° | 33° | 31–33° |
| actual | 33° |
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). Archive depth varies by city; receipts exist only for dates the archive watched arrive.