Was the forecast right for Atlanta on Mon Aug 17?
Atlanta, Georgia · daily high temperature in °F · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
13 days out, 4 models put Atlanta's Mon Aug 17 high anywhere from 80° to 94°; by the final call the field had settled to a median of 98°. The ECMWF IFS analysis says the day verified at 98° with 0.07 in of precipitation — drizzle.
ICON landed closest, off by 0.1°. GEM ran 4° cold.
What every model said, at every lead
Daily-high calls for Mon Aug 17 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 · 2026-08-02 | — | 84° | — | — | 92° | — | — | 84–92° |
| 14d · 2026-08-03 | 93° | 76° | — | — | 97° | — | — | 76–97° |
| 13d · 2026-08-04 | 80° | 94° | 87° | — | 84° | — | — | 80–94° |
| 12d · 2026-08-05 | 86° | 90° | 92° | — | 77° | — | — | 77–92° |
| 11d · 2026-08-06 | 89° | 96° | 87° | — | 99° | — | — | 87–99° |
| 10d · 2026-08-07 | 91° | 96° | 90° | — | 94° | — | — | 90–96° |
| 9d · 2026-08-08 | 94° | 95° | 99° | — | 86° | — | — | 86–99° |
| 8d · 2026-08-09 | 92° | 93° | 100° | 96° | 104° | — | — | 92–104° |
| 7d · 2026-08-10 | 94° | 95° | 100° | 91° | 101° | — | — | 91–101° |
| 6d · 2026-08-11 | 95° | 96° | 103° | 93° | 104° | 104° | — | 93–104° |
| 5d · 2026-08-12 | 95° | 96° | 103° | 95° | 104° | 105° | 99° | 95–105° |
| 4d · 2026-08-13 | 94° | 95° | 98° | 94° | 102° | 103° | 97° | 94–103° |
| 3d · 2026-08-14 | 94° | 96° | 98° | 95° | 103° | 101° | 98° | 94–103° |
| 2d · 2026-08-15 | 95° | 96° | 99° | 96° | 103° | 100° | 100° | 95–103° |
| 1d · 2026-08-16 | 95° | 97° | 99° | 96° | 99° | 99° | 99° | 95–99° |
| 0d · 2026-08-17 | 95° | 100° | 98° | 95° | 98° | 99° | 99° | 95–100° |
| 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 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 the ECMWF IFS analysis (temperature_2m_max). Archive depth varies by city; receipts exist only for dates the archive watched arrive.