Was the forecast right for Salt Lake City on Mon Sep 21?
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 21 high anywhere from 22° to 30°;by the call made on the day itself the field had settled to a median of 25°. The day verified at 26° against the SLC observations — cloudy.
GFS landed closest, off by 0.1°. AIFS ran 2° cool.
What every model said, at every lead
Daily-high calls for Mon Sep 21 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 · 2026-09-06 | — | 21° | — | — | 30° | — | — | 21–30° |
| 14d · 2026-09-07 | 22° | 27° | 23° | — | 30° | — | — | 22–30° |
| 13d · 2026-09-08 | 23° | 28° | 29° | — | 30° | — | — | 23–30° |
| 12d · 2026-09-09 | 25° | 27° | 28° | — | 23° | — | — | 23–28° |
| 11d · 2026-09-10 | 30° | 22° | 29° | — | 29° | — | — | 22–30° |
| 10d · 2026-09-11 | 26° | 22° | 28° | — | 32° | — | — | 22–32° |
| 9d · 2026-09-12 | 25° | 24° | 31° | 26° | 27° | — | — | 24–31° |
| 8d · 2026-09-13 | 25° | 24° | 26° | 26° | 29° | — | — | 24–29° |
| 7d · 2026-09-14 | 26° | 24° | 28° | 27° | 28° | — | — | 24–28° |
| 6d · 2026-09-15 | 24° | 23° | 27° | 24° | 27° | 26° | 24° | 23–27° |
| 5d · 2026-09-16 | 25° | 24° | 26° | 23° | 28° | 26° | 25° | 23–28° |
| 4d · 2026-09-17 | 25° | 24° | 26° | 24° | 27° | 27° | 25° | 24–27° |
| 3d · 2026-09-18 | 25° | 24° | 26° | 24° | 27° | 25° | 27° | 24–27° |
| 2d · 2026-09-19 | 25° | 24° | 25° | 24° | 26° | 25° | 26° | 24–26° |
| 1d · 2026-09-20 | 24° | 24° | 25° | 24° | 26° | 25° | 26° | 24–26° |
| 0d · 2026-09-21 | 23° | 24° | 26° | 25° | 26° | 25° | 26° | 23–26° |
| actual | 26° |
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. Archive depth varies by city; receipts exist only for dates the archive watched arrive.