Was the forecast right for Denver on Sat Aug 15?
Denver, Colorado · daily high temperature in °F · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
13 days out, 4 models put Denver's Sat Aug 15 high anywhere from 82° to 94°; by the final call the field had settled to a median of 81°. The ECMWF IFS analysis says the day verified at 81° with 0.12 in of precipitation — drizzle.
AIGFS landed closest, off by 0.7°. GEM ran 8° cold.
What every model said, at every lead
Daily-high calls for Sat Aug 15 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 · 2026-07-31 | — | 87° | — | — | 72° | — | — | 72–87° |
| 14d · 2026-08-01 | 74° | 77° | — | — | 95° | — | — | 74–95° |
| 13d · 2026-08-02 | 85° | 82° | 89° | — | 94° | — | — | 82–94° |
| 12d · 2026-08-03 | 73° | 92° | 77° | — | 91° | — | — | 73–92° |
| 11d · 2026-08-04 | 82° | 84° | 91° | — | 94° | — | — | 82–94° |
| 10d · 2026-08-05 | 79° | 81° | 76° | — | 88° | — | — | 76–88° |
| 9d · 2026-08-06 | 69° | 79° | 81° | — | 87° | — | — | 69–87° |
| 8d · 2026-08-07 | 64° | 84° | 76° | 79° | 85° | — | — | 64–85° |
| 7d · 2026-08-08 | 77° | 84° | 73° | 83° | 92° | — | — | 73–92° |
| 6d · 2026-08-09 | 77° | 84° | 74° | 80° | 89° | 83° | — | 74–89° |
| 5d · 2026-08-10 | 79° | 84° | 79° | 82° | 86° | 85° | 86° | 79–86° |
| 4d · 2026-08-11 | 79° | 83° | 81° | 80° | 86° | 84° | 87° | 79–87° |
| 3d · 2026-08-12 | 76° | 82° | 80° | 78° | 79° | 84° | 83° | 76–84° |
| 2d · 2026-08-13 | 78° | 81° | 79° | 76° | 88° | 86° | 84° | 76–88° |
| 1d · 2026-08-14 | 78° | 81° | 81° | 77° | 86° | 86° | 86° | 77–86° |
| 0d · 2026-08-15 | 79° | 81° | 76° | 73° | 86° | 82° | 82° | 73–86° |
| actual | 81° |
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.