Was the forecast right for Atlanta on Fri Jul 31?
Atlanta, Georgia · daily high temperature in °F · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
5 days out, 7 models put Atlanta's Fri Jul 31 high anywhere from 86° to 94°;by the final call, the day before, the field had settled to a median of 90°. The day verified at 90° against the ECMWF IFS analysis — cloudy.
AIGFS landed closest, off by 0.6°. GFS ran 4° warm.
What every model said, at every lead
Daily-high calls for Fri Jul 31 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 |
|---|---|---|---|---|---|---|---|---|
| 5d · 2026-07-26 | 86° | 88° | 94° | 87° | 93° | 92° | 93° | 86–94° |
| 4d · 2026-07-27 | 88° | 88° | 90° | 85° | 94° | 88° | 90° | 85–94° |
| 3d · 2026-07-28 | 88° | 90° | 92° | 87° | 96° | 87° | 90° | 87–96° |
| 2d · 2026-07-29 | 88° | 90° | 92° | 86° | 96° | 87° | 93° | 86–96° |
| 1d · 2026-07-30 | 88° | 90° | 91° | 87° | 94° | 87° | 92° | 87–94° |
| actual | 90° |
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). 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.