Was the forecast right for Denver on Thu Aug 6?
Denver, Colorado · daily high temperature in °F · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
12 days out, 4 models put Denver's Thu Aug 6 high anywhere from 90° to 101°;by the final call, the day before, the field had settled to a median of 96°. The day verified at 98° against the ECMWF IFS analysis — clear.
ECMWF landed closest, off by 0.6°. GEM ran 10° cool.
What every model said, at every lead
Daily-high calls for Thu Aug 6 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 |
|---|---|---|---|---|---|---|---|---|
| 12d · 2026-07-25 | 90° | 97° | 98° | — | 101° | — | — | 90–101° |
| 11d · 2026-07-26 | 90° | 89° | 99° | — | 91° | — | — | 89–99° |
| 10d · 2026-07-27 | 93° | 95° | 85° | — | 79° | — | — | 79–95° |
| 9d · 2026-07-28 | 98° | 81° | 102° | 94° | 96° | — | — | 81–102° |
| 8d · 2026-07-29 | 90° | 82° | 103° | 83° | 79° | — | — | 79–103° |
| 7d · 2026-07-30 | 80° | 85° | 102° | 88° | 90° | — | — | 80–102° |
| 6d · 2026-07-31 | 82° | 84° | 99° | 90° | 96° | 100° | 100° | 82–100° |
| 5d · 2026-08-01 | 88° | 89° | 91° | 89° | 97° | 100° | 97° | 88–100° |
| 4d · 2026-08-02 | 91° | 90° | 95° | 89° | 97° | 95° | 96° | 89–97° |
| 3d · 2026-08-03 | 95° | 95° | 97° | 90° | 99° | 96° | 96° | 90–99° |
| 2d · 2026-08-04 | 95° | 97° | 98° | 90° | 99° | 96° | 99° | 90–99° |
| 1d · 2026-08-05 | 95° | 95° | 97° | 88° | 97° | 96° | 99° | 88–99° |
| actual | 98° |
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.