Was the forecast right for Atlanta on Tue Aug 11?
Atlanta, Georgia · daily high temperature in °F · forecasts from each model's archived runs, verified against ERA5
13 days out, 4 models put Atlanta's Tue Aug 11 high anywhere from 78° to 105°; by the final call the field had settled to a median of 90°. ERA5 says the day verified at 88° with 0.14 in of precipitation — drizzle.
ICON landed closest, off by 1.0°. GFS ran 5° hot.
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 Atlanta scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-07-27 | — | 88° | — | — | 96° | — | — | 88–96° |
| 14d · 2026-07-28 | 88° | 89° | — | — | 97° | — | — | 88–97° |
| 13d · 2026-07-29 | 92° | 88° | 78° | — | 105° | — | — | 78–105° |
| 12d · 2026-07-30 | 86° | 82° | 79° | — | 84° | — | — | 79–86° |
| 11d · 2026-07-31 | 87° | 89° | 94° | — | 96° | — | — | 87–96° |
| 10d · 2026-08-01 | 89° | 86° | 94° | — | 81° | — | — | 81–94° |
| 9d · 2026-08-02 | 86° | 85° | 86° | — | 95° | — | — | 85–95° |
| 8d · 2026-08-03 | 88° | 85° | 90° | 79° | 94° | — | — | 79–94° |
| 7d · 2026-08-04 | 86° | 89° | 88° | 84° | 94° | — | — | 84–94° |
| 6d · 2026-08-05 | 85° | 89° | 88° | 86° | 91° | 84° | — | 84–91° |
| 5d · 2026-08-06 | 86° | 91° | 89° | 85° | 97° | 84° | 87° | 84–97° |
| 4d · 2026-08-07 | 88° | 91° | 88° | 79° | 96° | 87° | 87° | 79–96° |
| 3d · 2026-08-08 | 89° | 89° | 91° | 86° | 94° | 92° | 87° | 86–94° |
| 2d · 2026-08-09 | 89° | 91° | 91° | 88° | 95° | 92° | 86° | 86–95° |
| 1d · 2026-08-10 | 90° | 91° | 91° | 90° | 92° | 92° | 87° | 87–92° |
| 0d · 2026-08-11 | 90° | 92° | 91° | 90° | 94° | 87° | 87° | 87–94° |
| actual | 88° |
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 Atlanta — 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 ERA5 reanalysis (temperature_2m_max). Archive depth varies by city; receipts exist only for dates the archive watched arrive.