Was the forecast right for Atlanta on Sat Aug 1?
Atlanta, Georgia · daily high temperature · forecasts from each model's archived runs, verified against ERA5
5 days out, 7 models put Atlanta's Sat Aug 1 high anywhere from 78° to 95°; by the final call the field had settled to a median of 86°. ERA5 says the day verified at 87° with 0.38 in of precipitation — rain.
UKMO landed closest, off by 0.6°. AIFS ran 6° cold.
What every model said, at every lead
Daily-high calls for Sat Aug 1 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 · 2026-07-27 | 78° | 85° | 89° | 88° | 80° | 86° | 95° | 78–95° |
| 4d · 2026-07-28 | 79° | 81° | 94° | 80° | 83° | 78° | 93° | 78–94° |
| 3d · 2026-07-29 | 80° | 77° | 94° | 83° | 83° | 87° | 88° | 77–94° |
| 2d · 2026-07-30 | 80° | 82° | 86° | 87° | 83° | 85° | 90° | 80–90° |
| 1d · 2026-07-31 | 82° | 80° | 84° | 79° | 88° | 80° | 88° | 79–88° |
| 0d · 2026-08-01 | 81° | 86° | 89° | 83° | 88° | 84° | 86° | 81–89° |
| actual | 87° |
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.