Was the forecast right for Chicago on Tue Oct 6?
Chicago, Illinois · daily high temperature in °F · forecasts from each model's archived runs, verified against the MDW observations
13 days out, 4 models put Chicago's Tue Oct 6 high anywhere from 65° to 70°;by the final call, the day before, the field had settled to a median of 71°. The day verified at 74° against the MDW observations — partly cloudy.
GFS landed closest, off by 1.7°. ECMWF ran 4° cool.
What every model said, at every lead
Daily-high calls for Tue Oct 6 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 Chicago scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-09-21 | — | 57° | — | — | 75° | — | — | 57–75° |
| 14d · 2026-09-22 | 62° | 71° | — | — | 63° | — | — | 62–71° |
| 13d · 2026-09-23 | 66° | 70° | 67° | — | 65° | — | — | 65–70° |
| 12d · 2026-09-24 | 69° | 52° | 64° | — | 57° | — | — | 52–69° |
| 11d · 2026-09-25 | 68° | 54° | 65° | — | 55° | — | — | 54–68° |
| 10d · 2026-09-26 | 67° | 58° | 62° | — | 67° | — | — | 58–67° |
| 9d · 2026-09-27 | 62° | 67° | 67° | 74° | 80° | — | — | 62–80° |
| 8d · 2026-09-28 | 59° | 63° | 63° | 64° | 66° | — | — | 59–66° |
| 7d · 2026-09-29 | 64° | 63° | 58° | 68° | 64° | — | — | 58–68° |
| 6d · 2026-09-30 | 67° | 64° | 64° | 63° | 64° | 67° | 66° | 63–67° |
| 5d · 2026-10-01 | 67° | 67° | 67° | 65° | 68° | 69° | 68° | 65–69° |
| 4d · 2026-10-02 | 69° | 68° | 67° | 68° | 69° | 67° | 68° | 67–69° |
| 3d · 2026-10-03 | 71° | 73° | 68° | 68° | 73° | 70° | 69° | 68–73° |
| 2d · 2026-10-04 | 71° | 71° | 70° | 70° | 73° | 72° | 71° | 70–73° |
| 1d · 2026-10-05 | 71° | 71° | 70° | 72° | 72° | 72° | 71° | 70–72° |
| actual | 74° |
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 Chicago — 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 MDW 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.