Was the forecast right for Salt Lake City on Fri Sep 4?
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 Fri Sep 4 high anywhere from 27° to 36°;by the final call, the day before, the field had settled to a median of 31°. The day verified at 32° against the SLC observations — clear.
AIGFS landed closest, off by 0.1°. ECMWF ran 2° cool.
What every model said, at every lead
Daily-high calls for Fri Sep 4 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 · 2026-08-20 | 30° | 33° | — | — | 34° | — | — | 30–34° |
| 14d · 2026-08-21 | 27° | 31° | 32° | — | 36° | — | — | 27–36° |
| 13d · 2026-08-22 | 28° | 24° | 35° | — | 32° | — | — | 24–35° |
| 12d · 2026-08-23 | 26° | 26° | 34° | — | 31° | — | — | 26–34° |
| 11d · 2026-08-24 | 17° | 21° | 30° | — | 28° | — | — | 17–30° |
| 10d · 2026-08-25 | 23° | 26° | 24° | — | 31° | — | — | 23–31° |
| 9d · 2026-08-26 | 20° | 21° | 30° | 26° | 29° | — | — | 20–30° |
| 8d · 2026-08-27 | 27° | 22° | 30° | 26° | 32° | — | — | 22–32° |
| 7d · 2026-08-28 | 32° | 31° | 29° | 28° | 32° | 30° | — | 28–32° |
| 6d · 2026-08-29 | 31° | 34° | 31° | 29° | 33° | 22° | 26° | 22–34° |
| 5d · 2026-08-30 | 31° | 33° | 31° | 31° | 32° | 26° | 30° | 26–33° |
| 4d · 2026-08-31 | 31° | 32° | 30° | 31° | 30° | 27° | 29° | 27–32° |
| 3d · 2026-09-01 | 31° | 32° | 29° | 32° | 31° | 31° | 30° | 29–32° |
| 2d · 2026-09-02 | 31° | 32° | 31° | 32° | 32° | 31° | 29° | 29–32° |
| 1d · 2026-09-03 | 32° | 32° | 31° | 31° | 32° | 31° | 31° | 31–32° |
| 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 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.