Was the forecast right for Denver on Tue Aug 11?
Denver, Colorado · daily high temperature in °F · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
14 days out, 4 models put Denver's Tue Aug 11 high anywhere from 91° to 103°;by the final call, the day before, the field had settled to a median of 94°. The day verified at 97° against the ECMWF IFS analysis — drizzle.
GFS landed closest, off by 0.6°. GEM ran 4° cool.
What every model said, at every lead
Daily-high calls for Tue Aug 11 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 · 2026-07-27 | — | 86° | — | — | 90° | — | — | 86–90° |
| 14d · 2026-07-28 | 91° | 95° | 99° | — | 103° | — | — | 91–103° |
| 13d · 2026-07-29 | 76° | 97° | 100° | — | 100° | — | — | 76–100° |
| 12d · 2026-07-30 | 88° | 73° | 89° | — | 88° | — | — | 73–89° |
| 11d · 2026-07-31 | 86° | 82° | 104° | — | 89° | — | — | 82–104° |
| 10d · 2026-08-01 | 90° | 79° | 98° | — | 102° | — | — | 79–102° |
| 9d · 2026-08-02 | 89° | 85° | 92° | 92° | 96° | — | — | 85–96° |
| 8d · 2026-08-03 | 80° | 82° | 94° | 93° | 91° | — | — | 80–94° |
| 7d · 2026-08-04 | 86° | 86° | 92° | 89° | 94° | — | — | 86–94° |
| 6d · 2026-08-05 | 89° | 92° | 93° | 92° | 101° | 92° | 91° | 89–101° |
| 5d · 2026-08-06 | 90° | 90° | 97° | 93° | 99° | 97° | 96° | 90–99° |
| 4d · 2026-08-07 | 91° | 92° | 97° | 94° | 98° | 97° | 95° | 91–98° |
| 3d · 2026-08-08 | 92° | 93° | 96° | 92° | 98° | 96° | 96° | 92–98° |
| 2d · 2026-08-09 | 93° | 93° | 97° | 94° | 99° | 97° | 94° | 93–99° |
| 1d · 2026-08-10 | 94° | 94° | 96° | 93° | 97° | 97° | 93° | 93–97° |
| actual | 97° |
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.