Was the forecast right for Chicago on Tue Oct 6?
Chicago, Illinois · daily high temperature in °C · 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 18° to 21°;by the final call, the day before, the field had settled to a median of 22°. The day verified at 23° against the MDW observations — partly cloudy.
GFS landed closest, off by 0.9°. ECMWF ran 2° 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 | — | 14° | — | — | 24° | — | — | 14–24° |
| 14d · 2026-09-22 | 17° | 22° | — | — | 17° | — | — | 17–22° |
| 13d · 2026-09-23 | 19° | 21° | 20° | — | 18° | — | — | 18–21° |
| 12d · 2026-09-24 | 20° | 11° | 18° | — | 14° | — | — | 11–20° |
| 11d · 2026-09-25 | 20° | 12° | 19° | — | 13° | — | — | 12–20° |
| 10d · 2026-09-26 | 19° | 14° | 16° | — | 19° | — | — | 14–19° |
| 9d · 2026-09-27 | 17° | 19° | 20° | 23° | 27° | — | — | 17–27° |
| 8d · 2026-09-28 | 15° | 17° | 17° | 18° | 19° | — | — | 15–19° |
| 7d · 2026-09-29 | 18° | 17° | 14° | 20° | 18° | — | — | 14–20° |
| 6d · 2026-09-30 | 20° | 18° | 18° | 17° | 18° | 20° | 19° | 17–20° |
| 5d · 2026-10-01 | 19° | 19° | 19° | 18° | 20° | 20° | 20° | 18–20° |
| 4d · 2026-10-02 | 21° | 20° | 20° | 20° | 20° | 20° | 20° | 20–21° |
| 3d · 2026-10-03 | 22° | 23° | 20° | 20° | 23° | 21° | 21° | 20–23° |
| 2d · 2026-10-04 | 22° | 22° | 21° | 21° | 23° | 22° | 22° | 21–23° |
| 1d · 2026-10-05 | 22° | 22° | 21° | 22° | 22° | 22° | 22° | 21–22° |
| actual | 23° |
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.