Was the forecast right for Denver on Mon Aug 3?
Denver, Colorado · daily high temperature in °F · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
9 days out, 5 models put Denver's Mon Aug 3 high anywhere from 81° to 94°;by the final call, the day before, the field had settled to a median of 101°. The day verified at 102° against the ECMWF IFS analysis, with 0.04 in of precipitation — drizzle.
ICON landed closest, off by 0.4°. GEM ran 11° cool.
What every model said, at every lead
Daily-high calls for Mon Aug 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 · 2026-07-25 | 81° | 94° | 91° | 84° | 92° | — | — | 81–94° |
| 8d · 2026-07-26 | 87° | 94° | 101° | 96° | 102° | — | — | 87–102° |
| 7d · 2026-07-27 | 81° | 94° | 99° | 95° | 103° | — | — | 81–103° |
| 6d · 2026-07-28 | 86° | 97° | 99° | 90° | 102° | 95° | 93° | 86–102° |
| 5d · 2026-07-29 | 96° | 100° | 102° | 97° | 100° | 99° | 101° | 96–102° |
| 4d · 2026-07-30 | 96° | 100° | 101° | 96° | 103° | 101° | 101° | 96–103° |
| 3d · 2026-07-31 | 97° | 96° | 100° | 92° | 100° | 97° | 100° | 92–100° |
| 2d · 2026-08-01 | 96° | 100° | 100° | 95° | 101° | 102° | 99° | 95–102° |
| 1d · 2026-08-02 | 99° | 102° | 100° | 91° | 102° | 102° | 101° | 91–102° |
| actual | 102° |
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.