Was the forecast right for Salt Lake City on Wed Sep 23?
Salt Lake City, Utah · daily high temperature in °F · forecasts from each model's archived runs, verified against the SLC observations
14 days out, 4 models put Salt Lake City's Wed Sep 23 high anywhere from 74° to 81°;by the final call, the day before, the field had settled to a median of 75°. The day verified at 76° against the SLC observations — clear.
UKMO landed closest, off by 0.4°. AIGFS ran 2° cool.
What every model said, at every lead
Daily-high calls for Wed Sep 23 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 · 2026-09-08 | — | 70° | — | — | 84° | — | — | 70–84° |
| 14d · 2026-09-09 | 75° | 81° | 80° | — | 74° | — | — | 74–81° |
| 13d · 2026-09-10 | 58° | 67° | 74° | — | 91° | — | — | 58–91° |
| 12d · 2026-09-11 | 71° | 80° | 84° | — | 74° | — | — | 71–84° |
| 11d · 2026-09-12 | 83° | 66° | 79° | — | 82° | — | — | 66–83° |
| 10d · 2026-09-13 | 73° | 80° | 79° | — | 85° | — | — | 73–85° |
| 9d · 2026-09-14 | 80° | 81° | 74° | 62° | 80° | — | — | 62–81° |
| 8d · 2026-09-15 | 81° | 81° | 77° | 81° | 75° | — | — | 75–81° |
| 7d · 2026-09-16 | 78° | 78° | 78° | 80° | 82° | 71° | — | 71–82° |
| 6d · 2026-09-17 | 76° | 74° | 77° | 80° | 81° | 77° | 77° | 74–81° |
| 5d · 2026-09-18 | 77° | 76° | 78° | 79° | 81° | 76° | 78° | 76–81° |
| 4d · 2026-09-19 | 74° | 75° | 75° | 78° | 81° | 76° | 74° | 74–81° |
| 3d · 2026-09-20 | 73° | 73° | 76° | 78° | 79° | 77° | 77° | 73–79° |
| 2d · 2026-09-21 | 73° | 75° | 77° | 76° | 78° | 76° | 76° | 73–78° |
| 1d · 2026-09-22 | 75° | 74° | 75° | 75° | 76° | 75° | 76° | 74–76° |
| actual | 76° |
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.