Was the forecast right for Salt Lake City on Mon Sep 7?
Salt Lake City, Utah · daily high temperature in °C · forecasts from each model's archived runs, verified against the SLC observations
14 days out, 4 models put Salt Lake City's Mon Sep 7 high anywhere from 27° to 33°;by the final call, the day before, the field had settled to a median of 24°. The day verified at 25° against the SLC observations — drizzle.
AIFS landed closest, off by 0.6°. AIGFS ran 2° cool.
What every model said, at every lead
Daily-high calls for Mon Sep 7 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 Salt Lake City scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-08-23 | 26° | 28° | — | — | 19° | — | — | 19–28° |
| 14d · 2026-08-24 | 27° | 29° | 33° | — | 28° | — | — | 27–33° |
| 13d · 2026-08-25 | 30° | 27° | 33° | — | 33° | — | — | 27–33° |
| 12d · 2026-08-26 | 22° | 24° | 27° | — | 23° | — | — | 22–27° |
| 11d · 2026-08-27 | 28° | 26° | 28° | — | 29° | — | — | 26–29° |
| 10d · 2026-08-28 | 25° | 26° | 26° | — | 30° | — | — | 25–30° |
| 9d · 2026-08-29 | 26° | 26° | 25° | 27° | 32° | — | — | 25–32° |
| 8d · 2026-08-30 | 25° | 27° | 26° | 28° | 30° | — | — | 25–30° |
| 7d · 2026-08-31 | 23° | 28° | 30° | 23° | 27° | 21° | — | 21–30° |
| 6d · 2026-09-01 | 25° | 25° | 27° | 21° | 21° | 25° | 20° | 20–27° |
| 5d · 2026-09-02 | 25° | 22° | 21° | 23° | 29° | 21° | 26° | 21–29° |
| 4d · 2026-09-03 | 23° | 23° | 23° | 24° | 27° | 21° | 24° | 21–27° |
| 3d · 2026-09-04 | 23° | 21° | 24° | 23° | 22° | 23° | 25° | 21–25° |
| 2d · 2026-09-05 | 23° | 22° | 24° | 23° | 23° | 23° | 23° | 22–24° |
| 1d · 2026-09-06 | 24° | 23° | 24° | 24° | 23° | 24° | 23° | 23–24° |
| actual | 25° |
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 Salt Lake City — 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 SLC 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.