Was the forecast right for Salt Lake City on Sun Sep 27?
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 Sun Sep 27 high anywhere from 21° to 31°;by the final call, the day before, the field had settled to a median of 28°. The day verified at 29° against the SLC observations — cloudy.
GFS landed closest, off by 0.9°. AIGFS ran 2° cool.
What every model said, at every lead
Daily-high calls for Sun Sep 27 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 · 2026-09-12 | 14° | 28° | — | — | 27° | — | — | 14–28° |
| 14d · 2026-09-13 | 26° | 21° | 31° | — | 31° | — | — | 21–31° |
| 13d · 2026-09-14 | 23° | 27° | 27° | — | 25° | — | — | 23–27° |
| 12d · 2026-09-15 | 12° | 28° | 24° | — | 28° | — | — | 12–28° |
| 11d · 2026-09-16 | 24° | 23° | 29° | — | 19° | — | — | 19–29° |
| 10d · 2026-09-17 | 26° | 23° | 22° | — | 26° | — | — | 22–26° |
| 9d · 2026-09-18 | 24° | 29° | 26° | 25° | 24° | — | — | 24–29° |
| 8d · 2026-09-19 | 27° | 25° | 27° | 27° | 29° | — | — | 25–29° |
| 7d · 2026-09-20 | 28° | 29° | 24° | 26° | 31° | 28° | — | 24–31° |
| 6d · 2026-09-21 | 27° | 29° | 28° | 27° | 30° | 29° | 27° | 27–30° |
| 5d · 2026-09-22 | 26° | 29° | 27° | 27° | 30° | 28° | 27° | 26–30° |
| 4d · 2026-09-23 | 24° | 26° | 27° | 27° | 28° | 28° | 26° | 24–28° |
| 3d · 2026-09-24 | 27° | 27° | 28° | 28° | 28° | 28° | 27° | 27–28° |
| 2d · 2026-09-25 | 27° | 28° | 28° | 28° | 28° | 28° | 27° | 27–28° |
| 1d · 2026-09-26 | 28° | 27° | 28° | 28° | 28° | 28° | 28° | 27–28° |
| actual | 29° |
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.