Was the forecast right for Atlanta on Thu Aug 27?
Atlanta, Georgia · daily high temperature in °C · forecasts from each model's archived runs, verified against the ATL observations
6 days out, 7 models put Atlanta's Thu Aug 27 high anywhere from 24° to 31°;by the final call, the day before, the field had settled to a median of 31°. The day verified at 32° against the ATL observations, with 14.7 mm of precipitation — thunderstorms.
AIGFS landed closest, off by 0.4°. ICON ran 4° cool.
What every model said, at every lead
Daily-high calls for Thu Aug 27 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 |
|---|---|---|---|---|---|---|---|---|
| 6d · 2026-08-21 | 25° | 24° | 28° | 31° | 31° | 28° | 30° | 24–31° |
| 5d · 2026-08-22 | 29° | 26° | 30° | 31° | 34° | 31° | 29° | 26–34° |
| 4d · 2026-08-23 | 27° | 26° | 32° | 31° | 26° | 31° | 34° | 26–34° |
| 3d · 2026-08-24 | 28° | 28° | 32° | 29° | 23° | 32° | 33° | 23–33° |
| 2d · 2026-08-25 | 29° | 30° | 31° | 31° | 29° | 30° | 31° | 29–31° |
| 1d · 2026-08-26 | 30° | 32° | 29° | 31° | 34° | 28° | 31° | 28–34° |
| actual | 32° |
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 ATL observations. 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.