Was the forecast right for Denver on Mon Aug 31?
Denver, Colorado · daily high temperature in °C · forecasts from each model's archived runs, verified against the DEN observations
7 days out, 5 models put Denver's Mon Aug 31 high anywhere from 25° to 30°;by the final call, the day before, the field had settled to a median of 28°. The day verified at 30° against the DEN observations — drizzle.
GFS landed closest, off by 0.4°. ICON ran 4° cool.
What every model said, at every lead
Daily-high calls for Mon Aug 31 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 |
|---|---|---|---|---|---|---|---|---|
| 7d · 2026-08-24 | 25° | 25° | 28° | 26° | 30° | — | — | 25–30° |
| 6d · 2026-08-25 | 26° | 24° | 28° | 29° | 27° | 29° | 22° | 22–29° |
| 5d · 2026-08-26 | 25° | 28° | 29° | 28° | 29° | 28° | 28° | 25–29° |
| 4d · 2026-08-27 | 26° | 27° | 27° | 28° | 30° | 27° | 26° | 26–30° |
| 3d · 2026-08-28 | 27° | 27° | 29° | 28° | 30° | 27° | 27° | 27–30° |
| 2d · 2026-08-29 | 27° | 28° | 26° | 28° | 29° | 27° | 27° | 26–29° |
| 1d · 2026-08-30 | 27° | 27° | 29° | 29° | 30° | 26° | 28° | 26–30° |
| actual | 30° |
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. 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.