Was the forecast right for Phoenix on Sun Oct 11?
Phoenix, Arizona · daily high temperature in °C · forecasts from each model's archived runs, verified against the PHX observations
14 days out, 4 models put Phoenix's Sun Oct 11 high anywhere from 34° to 38°;by the final call, the day before, the field had settled to a median of 30°. The day verified at 32° against the PHX observations, with 6.6 mm of precipitation — thunderstorms.
ICON landed closest, off by 1.0°. AIGFS ran 3° cool.
What every model said, at every lead
Daily-high calls for Sun Oct 11 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 Phoenix scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-09-26 | — | 33° | — | — | 36° | — | — | 33–36° |
| 14d · 2026-09-27 | 37° | 35° | 38° | — | 34° | — | — | 34–38° |
| 13d · 2026-09-28 | 39° | 35° | 36° | — | 34° | — | — | 34–39° |
| 12d · 2026-09-29 | 37° | 35° | 36° | — | 33° | — | — | 33–37° |
| 11d · 2026-09-30 | 27° | 34° | 37° | — | 36° | — | — | 27–37° |
| 10d · 2026-10-01 | 35° | 36° | 38° | — | 35° | — | — | 35–38° |
| 9d · 2026-10-02 | 31° | 36° | 36° | 36° | 35° | — | — | 31–36° |
| 8d · 2026-10-03 | 30° | 36° | 36° | 36° | 35° | — | — | 30–36° |
| 7d · 2026-10-04 | 30° | 36° | 34° | 36° | 35° | — | — | 30–36° |
| 6d · 2026-10-05 | 28° | 34° | 32° | 32° | 32° | 35° | 37° | 28–37° |
| 5d · 2026-10-06 | 29° | 29° | 31° | 33° | 34° | 29° | 34° | 29–34° |
| 4d · 2026-10-07 | 28° | 31° | 31° | 31° | 30° | 25° | 31° | 25–31° |
| 3d · 2026-10-08 | 29° | 31° | 30° | 32° | 30° | 31° | 31° | 29–32° |
| 2d · 2026-10-09 | 29° | 29° | 32° | 30° | 30° | 31° | 30° | 29–32° |
| 1d · 2026-10-10 | 29° | 29° | 30° | 30° | 30° | 31° | 30° | 29–31° |
| 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 Phoenix — 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 PHX 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.