Was the forecast right for Salt Lake City on Sun Sep 13?
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 Sun Sep 13 high anywhere from 73° to 92°; by the final call the field had settled to a median of 89°. The day verified at 93° against the SLC observations — partly cloudy.
GFS landed closest, off by 1.1°. GEM ran 7° cold.
What every model said, at every lead
Daily-high calls for Sun Sep 13 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 · 2026-08-29 | — | 88° | — | — | 88° | — | — | 88–88° |
| 14d · 2026-08-30 | 73° | 84° | 85° | — | 92° | — | — | 73–92° |
| 13d · 2026-08-31 | 80° | 82° | 72° | — | 84° | — | — | 72–84° |
| 12d · 2026-09-01 | 78° | 77° | 64° | — | 79° | — | — | 64–79° |
| 11d · 2026-09-02 | 72° | 80° | 87° | — | 81° | — | — | 72–87° |
| 10d · 2026-09-03 | 89° | 72° | 80° | — | 64° | — | — | 64–89° |
| 9d · 2026-09-04 | 84° | 85° | 89° | 82° | 74° | — | — | 74–89° |
| 8d · 2026-09-05 | 68° | 68° | 80° | 92° | 67° | — | — | 67–92° |
| 7d · 2026-09-06 | 92° | 88° | 73° | 87° | 65° | — | — | 65–92° |
| 6d · 2026-09-07 | 87° | 90° | 76° | 92° | 72° | 88° | 83° | 72–92° |
| 5d · 2026-09-08 | 79° | 90° | 69° | 82° | 75° | 79° | 68° | 68–90° |
| 4d · 2026-09-09 | 91° | 85° | 80° | 90° | 80° | 78° | 81° | 78–91° |
| 3d · 2026-09-10 | 87° | 88° | 79° | 79° | 82° | 79° | 81° | 79–88° |
| 2d · 2026-09-11 | 88° | 87° | 84° | 89° | 91° | 86° | 82° | 82–91° |
| 1d · 2026-09-12 | 90° | 90° | 89° | 83° | 92° | 89° | 87° | 83–92° |
| 0d · 2026-09-13 | 90° | 89° | 88° | 86° | 92° | 91° | 88° | 86–92° |
| actual | 93° |
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.