Was the forecast right for Salt Lake City on Thu Sep 10?
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 Thu Sep 10 high anywhere from 27° to 34°;by the final call, the day before, the field had settled to a median of 30°. The day verified at 32° against the SLC observations — partly cloudy.
ECMWF landed closest, off by 0.9°. AIGFS ran 2° cool.
What every model said, at every lead
Daily-high calls for Thu Sep 10 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, labeled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-08-26 | 24° | 28° | — | — | 23° | — | — | 23–28° |
| 14d · 2026-08-27 | 32° | 27° | 34° | — | 30° | — | — | 27–34° |
| 13d · 2026-08-28 | 30° | 35° | 28° | — | 31° | — | — | 28–35° |
| 12d · 2026-08-29 | 30° | 28° | 30° | — | 35° | — | — | 28–35° |
| 11d · 2026-08-30 | 20° | 32° | 24° | — | 31° | — | — | 20–32° |
| 10d · 2026-08-31 | 20° | 24° | 21° | — | 28° | — | — | 20–28° |
| 9d · 2026-09-01 | 30° | 29° | 31° | 17° | 24° | — | — | 17–31° |
| 8d · 2026-09-02 | 30° | 29° | 32° | 25° | 27° | — | — | 25–32° |
| 7d · 2026-09-03 | 31° | 27° | 33° | 19° | 24° | 26° | — | 19–33° |
| 6d · 2026-09-04 | 31° | 29° | 32° | 30° | 30° | 31° | 30° | 29–32° |
| 5d · 2026-09-05 | 31° | 29° | 31° | 30° | 31° | 30° | 30° | 29–31° |
| 4d · 2026-09-06 | 30° | 31° | 31° | 29° | 32° | 32° | 28° | 28–32° |
| 3d · 2026-09-07 | 30° | 30° | 32° | 29° | 31° | 30° | 30° | 29–32° |
| 2d · 2026-09-08 | 30° | 30° | 31° | 29° | 30° | 31° | 30° | 29–31° |
| 1d · 2026-09-09 | 30° | 29° | 31° | 30° | 30° | 30° | 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 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 day was verified, usually 2 days after the date; a correction published after that is not carried into it. Archive depth varies by city; verified days exist only for dates the archive watched arrive.